Boechera shockleyi
Shockley's Rock cress
usually 1 per caudex branch, arising from center of rosette near ground surface, (0.8–)2–5 dm, densely pubescent proximally, trichomes short-stalked, 7–12-rayed, 0.1–0.2 mm, densely to sparsely pubescent distally.
blade oblanceolate, 3–10 mm wide, margins entire, not ciliate, surfaces densely pubescent, trichomes short-stalked, 7–12-rayed, 0.1–0.2 mm.
14–60, concealing stem for most of length;
blade auricles 0.5–4 mm, surfaces of distalmost leaves densely pubescent.
20–70-flowered, usually unbranched.
ascending at anthesis;
sepals pubescent;
petals lavender, 6–9 × 0.8–1.2 mm, glabrous;
pollen ellipsoid.
divaricate-ascending, straight, 7–28 mm, pubescent, trichomes appressed, branched.
divaricate-ascending, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, 4.5–11 cm × 1.5–2 mm;
valves glabrous or sparsely pubescent throughout;
ovules 140–190 per ovary;
style 0.05–0.6 mm.
sub-biseriate, 1–1.3 × 0.7–0.8 mm;
wing distal or, rarely, absent, 0.05–0.1 mm wide.
Boechera shockleyi
Boechera shockleyi is a distinctive sexual species recognizable by the combination of strongly overlapping cauline leaves, a dense covering of minute, 7–12-rayed trichomes, and relatively long, curved, divaricate-ascending fruits with sub-biseriate seeds. It is most similar to B. inyoensis, but differs from that species in its narrower (0.8–1.2 versus 1.2–2 mm) petals, eciliate basal leaves with smaller (0.1–0.2 versus 0.2–0.7 mm) trichomes, greater number (140–190 versus 74–134) of ovules per ovary, and shorter (1–1.3 versus 1.7–2 mm) seeds with distal (versus continuous) wings.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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