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Draba henrici
(Henk’s draba)

[taxon report][distribution map][all photos][line drawing]



Family: Brassicaceae

Scientific Name: Draba henrici Al-Shehbaz

Synonyms:

Vernacular Name: Henk’s draba

R-E-D Code: 3-3-3

Description: Perennial herb, not cespitose; caudex few to several branched. Stems (2–) 4–10(–12) cm, erect to ascending or rarely subdecumbent. Basal leaves rosulate; petiole 2–5 mm, usually ciliate, persistent; leaf blade narrowly oblanceolate, 5–12 Χ 1–2 mm, both surfaces moderately pubescent with stalked, 4(–7)-rayed trichomes, base attenuate, margin entire, apex subobtuse; cauline leaves (8–)10–16(–20), overlapping, lanceolate to oblong or narrowly ovate, entire or rarely denticulate, both surfaces with stalked, non-crisped, 4(–7)-rayed trichomes. Racemes ebracteate, 6–15-flowered, corymbose, elongated in fruit; rachis straight, pubescent with crisped, minutely stalked, 4–7-rayed trichomes. Sepals green with white margin, ovate, 1.5–2 mm, ascending, pubescent with crisped, branched trichomes. Petals white, oblanceolate, 3–3.5 Χ 1–1.5 mm; filaments white, 1.5–2 mm. Fruit (immature) narrowly oblong, 6–8 Χ ca. 1.5 mm, slightly twisted, sessile, divaricate-ascending, not appressed to rachis; valves puberulent with simple and 2(–4)-rayed trichomes. Flowers in July to early August.

Similar Species: Draba henrici can be distinguished from other sympatric Drabas by its white flowers and smaller petals.


Distribution: New Mexico, Taos County

Habitat: Alpine tundra above 11,000 ft (3,350m)

Remarks: Not much is known about the actual distribution and abundance of this species. Needs more surveys and documentation in alpine areas.

Conservation Considerations: Only known populations are along trails in remote alpine areas. Limited distribution and high elevation habitats make this species vulnerable to climate change.

Important Literature (*Illustration):

*Al-Shehbaz, I.A. 2013 Draba henrici (Brassicaceae), a new species from northern New Mexico. Harvard Papers in Botany 18 (1): 91-93

Information Compiled By: Daniela Roth, 2016


Photo credits in header Peniocereus greggii var. greggii © T. Todsen,
Lepidospartum burgessii © M. Howard, Argemone pleiacantha ssp. pinnatisecta © R. Sivinski
©2005 New Mexico Rare Plant Technical Council