Flora of North America species comparison

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Eremothera boothii subsp. decorticans
Photo is of parent taxon

shredding evening-primrose
Habit Herbs glabrate to strigillose, sometimes also glandular puberulent in inflorescence.
Stems

stout, hollow, 12–65 cm.
Leaves

primarily clustered toward base, 2–11 × 0.3–2(–3) cm;

petiole 0–4.2 cm;

blade lanceolate, sometimes narrowly ovate or elliptic proximally, margins entire or denticulate.
Inflorescences

± open.
Flowers

floral tube 4–6 mm;

petals usually white, rarely red, 3.5–5 mm.
Capsules

nearly straight, curved outward, tapering abruptly distally, 1.7–2.3 mm diam. near base.
Seeds

dimorphic.

Eremothera boothii subsp. decorticans
Phenology Flowering Feb–Jun(–Jul).
Habitat Open, usually steep slopes, shale or other loose rocky sites.
Elevation 0–1900 m. (0–6200 ft.)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Subspecies decorticans is known from the southern Sierra Nevada Foothills, Tehachapi Mountain area, southern San Joaquin Valley, San Francisco Bay area, Inner South Coast Ranges, and Western Transverse Ranges.

Subspecies decorticans intergrades with subsp. desertorum. Occasional populations of subsp. decorticans at relatively high elevations in the southern part of its range have somewhat smaller flowers and red petals; they have been distinguished as Oenothera rutila or, more recently, O. boothii subsp. rutila. P. H. Raven (1969) saw no evidence that the various populations with this combination of characteristics had a common origin and, even if they did, they do not appear to constitute a major geographical race comparable with the other subspecies of Eremothera boothii.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Eremothera > Eremothera boothii
Sibling taxa
E. boothii subsp. alyssoides, E. boothii subsp. boothii, E. boothii subsp. condensata, E. boothii subsp. desertorum, E. boothii subsp. intermedia
Synonyms Gaura decorticans, Camissonia boothii subsp. decorticans, C. boothii var. decorticans, C. boothii subsp. rutila, Oenothera alyssoides var. decorticans, O. boothii subsp. decorticans, O. boothii subsp. rutila, O. decorticans, O. decorticans var. rutila, O. rutila, Sphaerostigma decorticans, S. rutilum
Name authority (Hooker & Arnott) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 209. (2007)
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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