Flora of North America species comparison

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Asclepias cryptoceras subsp. davisii
Photo is of parent taxon

Humboldt Mountains or pallid or Davis' or jewel milkweed
Leaves

petiole 2–8 mm;

blade oval to ovate or obovate or orbiculate, 3–7 × 1.8–4.8 cm, apex rounded to acute, venation eucamptodromous, surfaces glabrous.
Inflorescences

3–8-flowered.
Pedicels

16–25 mm.
Flowers

calyx lobes 5–6 mm;

corolla lobes 8–11 mm;

fused anthers dark brown, green at apex, 1.8–2.5 mm;

corona segments pinkish purple, 5–6(–7) mm, apices (including recurved tooth) exceeded by or equaling style apices.

Asclepias cryptoceras subsp. davisii
Phenology Flowering Apr–Jul; fruiting May–Jul.
Habitat Slopes, hills, arroyos, basalt, silicic tuff, limestone, chert, serpentine, gravel, sand and clay soils, juniper woodlands, shrubby grasslands, steppe.
Elevation 300–1500(–2100) m. [1000–4900(–6900) ft.]
Distribution
from FNA
CA; ID; NV; OR; WA
Discussion

Subspecies davisii just enters Washington in Asotin County and is exceedingly rare in the state, where it is considered to be of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 14. Treatment author: Mark Fishbein.
Parent taxa Apocynaceae > Asclepias > Asclepias cryptoceras
Sibling taxa
A. cryptoceras subsp. cryptoceras
Synonyms A. davisii, A. cryptoceras var. davisii
Name authority (Woodson) Woodson: Ann. Missouri Bot. Gard. 41: 180. (1954)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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