Flora of North America species comparison

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Pterostegia drymarioides

fairy mist, woodland pterostegia, woodland threadstem
Habit Plants 0.1–10(–12) dm across.
Leaves

petiole 0.2–0.6(–1) cm;

blade 0.3–2 × 0.5–2.5(–3) cm.
Flowers

perianth 0.9–1.2 mm;

filaments 0.5–0.6 mm;

anthers 0.2–0.3 mm.
Achenes

1.2–1.5 mm.
Involucral

bracts 1–1.5(–3) × (1.5–)2-3(–3.5) mm.
2n

= 28.

Pterostegia drymarioides
Phenology Flowering Mar–Jul.
Habitat Sandy to gravelly soils in shady places in grassland and chaparral communities, and in oak-pine or occasionally montane conifer woodland
Elevation 0-1600 m (0-5200 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

The only presumed Oregon collection of Pterostegia drymarioides (Tolmie s.n., GH) was gathered along the Columbia River sometime in the 1830s. The only collection reportedly from New Mexico (Parry et al. 1171, US) supposedly was found in the Rio Grande Valley in the 1850s during the United States-Mexico Boundary Survey. The species likely will be found in southern Oregon (not northern), but it is unlikely that it ever occurred in New Mexico. A problem is that this species is often difficult to notice, as the plants tend to be in the shade under shrubs. Specimens often are misidentified as Parietaria (Urticaceae)—See Flora of North America volume 3, pages 406–408.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 478.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Pterostegia
Name authority Fischer & C. A. Meyer: Index Seminum (St. Petersburg) 2: 48. (1836)
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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