Platanthera chorisiana

Platanthera chorisiana (Cham.) Rchb. f.:
China (Asia)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

B.C.; Alaska, Wash.; Asia (Kamchatka to Japan).

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Russian Federation

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: Alaska (Juneau, Prince William Sound, Cleveland Penninsula), Aleutian Islands (Adak, Atka, Atu, and Unalaska), British Columbia (Vancouver and Queen Charlotte Islands), and Washington. Japan and Kamchatka Peninsula (var. elatior). Also presumably in Russia.

Plants 4–20(–30) cm. Leaves (1–)2(–4), spreading, subopposite toward base of stem; bracts  (0–)1(–2) distally; blade elliptic, lanceolate, to suborbiculate, 2–9 × 0.9–4 cm. Spikes rather lax to dense. Flowers incompletely resupinate, inconspicuous, greenish; lateral sepals porrect; petals broadly ovate, margins entire; lip projecting forward, concave, orbiculate, ovate, or elliptic, without basal thickening, 1.5–2.5 × 1.2–2 mm, margins entire; spur stoutly cylindric to saccate, obtuse, 0.7–1.25 mm; rostellum lobes spreading, directed downward, minute, obscure; pollinaria straight; pollinia evidently remaining enclosed in anther sacs; viscidia oblong to suborbiculate-quadrangular; ovary rather stout, mostly 2–4 mm. 2n = 42.

Habenaria chorisiana Chamisso, Linnaea 3: 31. 1828; Limnorchis chorisiana (Chamisso) J. P. Anderson; Pseudodiphryllum chorisianum (Chamisso) Nevski

Wet tundra, meadows, bogs; 0--400m.

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 21 to >300

Comments: Known from three sites in Washington, at least 20 occurrences in coastal southern Alaska and the Aleutians. Many more likely exist in Alaska. Also in British Columbia.

Flowering Jul--Aug.

Canada

Rounded National Status Rank: N3 - Vulnerable

Russian Federation

Rounded National Status Rank: N1 - Critically Imperiled

United States

Rounded National Status Rank: N3 - Vulnerable

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Not very widespread, occurs in specialized habitat. Has been found in many additional locations in Alaska when actively sought. Its habitat in South Coastal Alaska is fairly common and more populations likely exist. Also in BC, WA.

Comments: Unknown, inventory needed.