Noccaea fendleri subsp. siskiyouensis

(P. K. Holmgren) Al-Shehbaz & M. Koch

Syst. Bot. 29: 383. 2004.

Basionym: Thlaspi montanum var. siskiyoense P. K. Holmgren Mem. New York Bot. Gard. 21(2): 84. 1971
Treatment appears in FNA Volume 7. Treatment on page 603. Mentioned on page 601, 602.

Stems (0.6–)0.7–1.6(–2.4) dm. Basal leaves: petiole differentiated from blade, (1.7–)2–3.6(–4) times longer than blade; blade ovate to oblong, 4–8(–9) mm wide, base cuneate. Cauline leaves 2–6. Racemes lax to compact. Fruiting pedicels horizontal or slightly descending, forming an angle 80º or more with rachis. Flowers: petals white, 3.8–6 × 1.2–2.2(–2.9) mm. Fruits often strongly winged, obovate to obdeltate, (4–)4.8–7(–8) × (3–)3.5–5.5(–6) mm, 1–2 times as long as wide, apex truncate to strongly emarginate; style (0.8–)1–2 mm. Seeds 2–4 per fruit. 2n = 14.

Phenology: Flowering Apr–Jun.
Habitat: Moist, open rocky serpentine slopes
Elevation: 300-500 m


Subspecies siskiyouensis is known from Curry, Douglas, and Josephine counties.

Selected References


Lower Taxa