checklist of the arctic species of the genus Oxytropis DC.Subgen. Phacoxytropis Bunge
Sect. Mesogaea Bunge
1. Oxytropis deflexa (Pall.) DC. ssp. deflexa.
2n=16. East Siberian-North Mongolian hypoarctic-montane type subspecies.
2. O. deflexa ssp. dezhnevii (Jurtz.) Jurtz.
2n=16. Endemic of the easternmost Chukotka Peninsula. Calcicolous.
3. O. deflexa ssp. foliolosa (Hook.) Barneby
2n=16. Alaskan-Canadian hypoarctic race.
Subgen. Oxytropis (Euoxytropis Bunge)
Sect. Arctobia Bunge (incl. sect. Caeciabia Bunge)
Series Nigrescentes Jurtz.
4. O. nigrescens (Pall.) Fisch. 2n=16. East Siberian
metaarctic species; the type species of the series.
5. O. czukotica Jurtz. 2n=32. Chukotka-Okhotia-Kolyma
metaarctic species; the only locality in North America is Ogotoruk Creek at Cape Thompson
in the northwesternmost Alaska.
6. O. pumilio (Pall.) Bunge. 2n=16 (the data from the
northernmost Kuriles and southernmost Kamtchatka). Kamchatka-Kurile south-metaarctic
species. The only specimen from the Panarctic Flora area was collected on the northern
Series Bryophilae Jurtz.
7. O. bryophila (Greene) Jurtz. 2n=16, 32(?).
Alaska-Yukon metaarctic species with two localities in the easternmost Chukotka Peninsula.
The type of the series.
8. O. glaberrima Hult. North Alaskan low-arctic montane
taxon, its status needs further examination. It may be a glabrous race of O. bryophila.
Known from the only locality on the northern slope of Brooks Range.
9. O. kokrinensis A.E.Pors. 2n=16. West Alaskan
metaarctic endemic species, in part sympatric with O. bryophila. The vaucher
specimen for K.Holmen's counting 2n=16 for O. nigrescens contains both O.
bryophila and O. kokrinensis, but no O. nigrescens.
10. O. gorodkovii Jurtz. 2n=16,32. Amphi-Beringian arctic
pulvinate calcicolous species. Tetraploid plants are sympatric with the diploid ones and
have no visible morphological distinctions.
11. O. arctobia Bunge ssp. arctobia. Canadian
arctic (mostly high-arctic) type subspecies with the main area of distribution in the
Canadian Arctic Archipelago (the other race, ssp. subarctobia Jurtz. occurs in the
northern Canadian Rockies). Pulvinate calcicolous plants.
Subsect. Kamtschaticae Jurtz.
12. O. sublongipes Jurtz. 2n=16. Hypoarctic species with
a rather narrow endemic distribution in the inner (stlanic and taiga) parts of the Anadyr
River drainage and in the northern Koryak Mountains; the plant of gravelly flood-plains
with close but clearly distinctive species O. kamtschatica Hult. (Kamchatka
Peninsula, Karaginskiy Island etc.) forms the subsect. Kamtschaticae Jurtz.
possibly representing an ancestral type of the other lineages in the sect. Arctobia.
13. O. revoluta Ledeb. 2n=16. Kamchatka-North Koryak
metaarctic oceanic species, the most typical of the alpine belt of the mountain-taiga
areas. Weakly penetrates the Arctic along the Koryak Coast. The type species of the
subsection (2 species in the easternmost North Asia).
Subsect. Podocarpae Jurtz.
14. O. podocarpa Gray. 2n=16. North American
arctic-alpine species with great disjunction between northern Hudson Bay areas and the
Rockies. The type species of the olygotypic subsection. The related species O.
huddelsonii Pors. populates unglaciated alpine areas in Central Alaska.
Subsect. Mertensianae Jurtz.
15. O. scammaniana Hult. Alaskan
metaarctic endemic species penetrating the Arctic in the central part of Brooks Range.
16.O. mertensiana Turcz. 2n=16. Siberian-Alaskan
metaarctic species, typical of mesic-moist habitats.
Sect. Orobia Bunge (incl. Diphragmae Bunge)
Oxytropis adamsiana aggregate (Nr. 17-23).
17. O. adamsiana (Trautv.) Jurtz. ssp. adamsiana.
2n=32. East Siberian metaarctic (mainly arctic) type subspecies of the very polymorphic
18. O. adamsiana ssp. janensis Jurtz. 2n=32. East
Siberian (mainly North-East Yakutian: Yana-Indigirka Rivers drainages) subarctic (northern
boreal) subspecies, weakly penetrating the Arctic in the southern Kharaulakh Range along
19. O. uschakovii Jurtz. 2n=32. Endemic of Wrangel Island, closest to
O. adamsiana ssp. adamsiana.
20. O. vassilczenkoi Jurtz. ssp. vassilczenkoi.
2n=32, 48. Chukotka hypoarctic type subspecies (mesophilous eco-geographic race),
penetrating the eastern coastal areas with maritime climate.
21. O. vassilczenkoi ssp. substepposa Jurtz.
2n=32, 48. Indigirka-Chukotka hypoarctic subspecies (meso-xerophilous eco-geographic race)
lacking in Chukotka Peninsula and Koryak Coast, but penetrating the North East Yakutia.
Partly sympatric with the Nr. 20.
22. O. roaldii Ostenf. Alaska-Yukon arctic species which
is usually considered a synonym of Oxytropis arctica; however by the
structure of spike, calyx and pods it belongs rather to O. adamsiana agg.,
as well as the next species and, beyond the Arctic, O. davisii (Welsh.)
Jurtz. in the Canadian Rockies.
23. O. terra-novae Fern. 2n=48. East Canadian hypoarctic
coastal species, most common on Labrador Peninsula. Its position in O. adamsiana
agg. is a bit questionable and needs special examination.
24. O. koyukukensis A.E.Pors. 2n=48. Alaskan metaarctic
endemic species. Closer affinity is unclear.
25. O. arctica R.Br. ssp. arctica. 2n=ca.80, 96.
West-central North American arctic type subspecies, with wider distribution on the
mainland (in the Canadian Arctic Archipelago only on the westernmost islands).
26. O. arctica ssp. taimyrensis Jurtz. 2n=64. Middle
Siberian metaarctic (mostly arctic) subspecies separated by a great gap from the
westernmost localities of ssp. arctica.
27. O. tikhomirovii Jurtz. 2n=16. Middle Siberian
(Taimyr) endemic weakly penetrating the subarctic Putorana Plateau. A plant with
combination of characters of O. arctica and O. nigrescens,
possibly a hybridogenous species, but with the chromosome number of the latter. One cannot
exclude the possibility that the taxon has arisen due transformation of O. nigrescens alone.
28. O. semiglobosa Jurtz. 2n=16. North-East Asian
metaarctic calciphilous species with rather sporadic distribution. The only closely
related species O. ajanensis (Regel et Tiling) Bunge occurs in the vicinity
of Port Ayan on the westernmost coast of Okhotsk Sea.
29. O. ochotensis Bunge. 2n=48, 64. Northeast Asian
metaarctic species with disjunctive distribution: 1) the upper Kolyma-Indigirka drainages;
2) the Kolyma-Okhotian divide up to the coast of Sea of Okhotsk; 3) Anyui Mountains up to
the Kolyma delta; 4) isolated locality in the northern Chukotka Mountains (the population
with 2n=48, but without visible distinctions in its morphology from the Anyui Mountains
population with 2n=64)
30. O. maydelliana Trautv. ssp. maydelliana.
2n=96. Amphi-Beringian metaarctic (mostly arctic) type subspecies of the Chukotka-American
31. O. maydelliana ssp. melanocephala
(Hook.) A.E.Pors. Central East Canadian arctic subspecies.
Oxytropis leucantha aggregate (Nr. 32-34).
32. O. leucantha (Pall.) Bunge emend. Welsh ssp. subarctica
Jurtz. 2n=48, 96. Middle-East Siberian hypoarctic subspecies of the mainly East Siberian
arctic-boreal-montane species O. leucantha (O. leucantha agg.
is a part of what might be called the O. campestris superaggregate; see the
comments above). The type ssp. leucantha is common in the boreal parts of Yakutia
being replaced to the north and northeast by Nr.Nr. 32 and 33.
33. O. leucantha ssp. tschukotcensis Jurtz. 2n=48,
64, 96. Northeast Asian hypoarctic subspecies. O. dorogostaiskii Kuzen.,
with which it was previously confused, is an alpine plant of the southern East Siberia, of
the same aggregate.
34. O. hyperborea A.E.Pors. Alaskan-West-Central
Canadian metaarctic (or hypoarctic if taken wider) taxon closely adjoining O. leucantha
agg., especially O. leucantha ssp. tschukotcensis. Possibly includes
two or more races which need special study.
35. O. jordalii A.E.Pors. 2n=16. Alaska-Yukon metaarctic
calcicolous species which does not belong to O. leucantha agg. and probably
should be referred to North American complex (e.g. O. varians agg.),
together with Nr. 36 and O. gracilis (Nels.) Schum.
36. O. varians (Rydb.) K.Schum. 2n=16. West
American boreal (montane) species reaching the southern boundary of the Arctic at last
near Great Bear Lake. Delimitation with O. hyperborea should be specified
(with respect to the areas of distribution).
37. O. johannensis (Fern.) Fern. Mostly subarctic species
of the Atlantic coast of Canada (Gaspe Peninsula and its vicinity); the arctic records
should be checked.
Oxytropis sordida aggregate (Nr. 38-43).
38. O. katangensis Basil. Middle Siberian boreal
species mainly restricted to the Yenissey River drainage and reaching the southern limit
of the Arctic in the Yenissey valley near Dudinka. Its relationship to the O. sordida
agg. is probable (one of the possible progenitors of this lineage).
39. O. sordida (Willd.) Pers. ssp. sordida. 2n=48.
East European - West and Middle Siberian mainly arctic type subspecies of the
Eurasian-West American arctic-to metaarctic species. The zonal type of distribution in
ssp. sordida changes from the arctic-boreal in the west to the metaarctic in Ural
Mountains and arctic in the Yamal-Gydan and Taimyr areas.
40. O. sordida ssp. arctolenensis Jurtz. 2n=96.
Kharaulakh low arctic (montane) endemic subspecies. Some characters are in common with O.
leucantha ssp. Subarctica which is spread in the Arctic to the northwest and
east of the northern Kharaulakh (and elsewhere).
41. O. sordida ssp. schamurinii Jurtz.
2n=96. North-East Asian arctic (montane) subspeices with disjunctive distribution in the
north-eastern Yakutias mainland (the northernmost point), in Wrangel Island and in
the northern Chukotka Mountains.
42. O. beringensis Jurtz. 2n=96. Northeasternmost
Chukotka Peninsula low arctic calcicolous rare endemic species, clearly belonging to the O.
sordida agg. The consideration of this taxon as a subspecies of O. sordida
should be discussed (Yurtsev et al., 1994).
43. O. sordida ssp. barnebyana (Welsh) Jurtz.
Alaskan arctic endemic with sporadic distribution and prominent interpopulationary
variability which is still greater expressed in a close taxon ssp. schamurinii. The
plant is similar in general appearance to O. arctica, with which it is
sympatic in Alaska, but also with the east Taimyr population of O. sordida
ssp. sordida and with ssp. schamurinii. American authors evidently
underestimate the diagnostic value of colour of petals (red versus sordida white with
lilac spot on keel). So, the plant of concern was described as O. arctica
var. barnebyana Welsh. and, vice versa, many red-flowered oxytrops are referred to O.
campestris s.lat. (see above the comments on parallel race-formation in closely
Sect. Baicalia Bunge
44. O. schmorgunoviae Jurtz. 2n=48. Hypoarctic
montane-steppe endemic species with disjunctive distribution in highly continental right
bank parts of the Kolyma River drainage penetrating the Arctic in the northern foothills
of Anyui Mountains. Belongs to the North-East Asian mountain-steppe O. scheludjakoviae
Karav. et Jurtz. agg.
45. O. sverdrupii Lynge. 2n=48. Arctic
tundra-steppe endemic species of Ayon Island (northern Chaun Bay).
46. O. wrangelii Jurtz. 2n=64. Chukotkan arctic endemic
species, known from Wrangel Island (many localities) and two localities in the western and
central Chukotka Peninsula.
47. O. splendens Dougl. North American steppe and prairie
species, reaching the southern boundary of the Arctic at the south-western coast of Hudson
Bay. Closely related to O. scheludjakoviae agg.
48. O. bellii (Britt.) Palib. Arctic species
endemic to the western and northern coasts of Hudson Bay and to some neighbouring
49. O. putoranica M.Ivanova. 2n=16. Middle Siberian
metaarctic pulvinate rare endemic species, the type of the subsection.
50. O. uniflora Jurtz. 2n=16. Wrangel Island
arctic endemic calcicolous species found in the very centre of the island in one locality.
Sect. Glaeocephala Bunge
Oxytropis viscida aggregate (Nr. Nr. 52-54).
51. O. vasskovskyi Jurtz. 2n=16, 32. East
Siberian hypoarctic (montane) species penetrating the Arctic within Anyui Mountains and on
Ayon Island (western Chukotka).
52. O. inopinata Jurtz. 2n=16. East Siberian (the montane
valley of the Lena River in its lower reaches) hypoarctic rare endemic species.
53. O. kateninii Jurtz. Eastern Chukotka Peninsula low
arctic rare endemic species (a single locality known).
54. O. viscida Nutt. 2n=16, 32 (non-arctic populations).
West American boreal-montane highly variable species recorded for few southern mountainous
parts of arctic Alaska.
55. O. borealis DC. 2n=48. Amphi-Beringian mainly arctic
(metaarctic in Alaska) species, possibly the arctic derivative of O. viscida
agg. In the eastern Alaska is replaced by a close species (race?) O. glutinosa.
The demarcation with the following taxon should be specified as well as the relation of
the pair to the O. viscida affinity.
56. O. glutinosa A.E.Pors. 2n=16. East Beringian
57. O. hudsonica (Greene) Fern. Central Canadian-West
Hudsonian low arctic species of a more distant affinity of O. viscida agg.
58. O. middendorffii Trautv. ssp. middendorffii.
2n=48. Middle Siberian metaarctic (mostly arctic) type subspecies of the East
Siberian-North-East Asian metaarctic species O. middendorffii s.lat. (Nr.Nr.
59. O. middendorffii ssp. orulganica Jurtz. 2n=48.
East Siberian (Orulgan Range) hypoarctic (montane) endemic subspecies, weakly penetrating
the Arctic in the northern Kharaulakh Range. There is a transition zone to ssp. middendorffii.
60. O. middendorffii ssp. submiddendorffii Jurtz.
2n=48. Chukotkan arctic subspecies replaced in the subarctic Verkhoyansk Range and
Cherskiy Range by the closest ssp. jarovoi Jurtz.
61. O. middendorffii ssp. coerulescens
Jurtz. et Petrovsky. 2n=48. West Chukotkan (Anyui Mountains) metaarctic (montane) endemic
62. O. middendorffii ssp. schmidtii (Meinsh.)
Jurtz. 2n=48. Middle Siberian (East Yenissey) hypoarctic (montane) subspecies endemic to
Norilsk Mountains near the forest tundra boundary; combines some characters of ssp. middendorffii
and ssp. anadyrensis.
63. O. middendorffii ssp. anadyrensis (Vass.)
Jurtz. 2n=48. Chukotkan mainly low arctic subspecies with outlying localities (non typical
forms) in the subarctic North-East Yakutia and in the Koryak Mountains. Somewhat deviates
in its morphology to O. vasskovskyi.
64. O. middendorffii ssp. trautvetteri (Meinsh.)
Jurtz. West Okhotian southern hypoarctic subspecies with a remote locality on South
Chukotka (Pekulney Range, non-typical form).
Distribution of taxa of the genus Oxytropis DC. within the
Arctic. Grade of commonness/rareness of a taxon within the area: c - common (frequent), s
- sporadic, r - rare. Explanation of the names of floristic areas is given in the legend
to Fig. 2 and on Fig.1.