60 BOTANICAL GAZETTE [JULY 
Sisymbrium umbrosum.— Erect branched perennial 6™ high ; stem 
pale purple, terete, covered with simple spreading soft white hairs below, 
nearly or quite glabrous above; slender curved-ascending branches 
simple: radical leaves several (including the petiole), 1.3-1.5™ long; 
the petiole and midrib densely covered with simple spreading white 
hairs; the blade lyrate-pinnatifid, appressed-villous on both surfaces, 
3-5-4™ broad at the widest part; segments rounded and crenately 
toothed or lobed ; cauline leaves much smaller, deeply and rather 
evenly pinnatifid, short-petioled, exauriculate, the segments 5-9, 
oblong, acute or acuminate, the sinuses rounded, relatively broad: 
peduncles 3-10™ long ; racemes erect, 1.5-3°" long ; pedicels widely 
spreading or ascending, sparingly pilose or glabrate, slightly thickened 
at the summit: sepals ovate-oblong, obtuse, 3" in length, sometimes 
villous dorsally : petals white, rather narrow, 6™" long: pods very nar- 
row, linear, about 4™ long, loosely spreading, often curved outward, 
glabrous, 0.7™™ broad, scarcely beaked ; the stigma obscurely 2-lobed; 
the lobes over the placentze ; Seeds apparently in 1 row.— Collected by 
C. V. Hartman in shady places among rocks, Puerto de San Dieg®, 
Chihuahua, altitude 2000", 12 April, 1891, no. 629. Type in herb. 
Gray. Distributed as Thelypodium auriculatum, of which it has some 
what the habit; from this, however, it differs markedly in pubescence 
and exauriculate leaves. The orientation of the stigma places this 
species in Sisymbrium rather than Thelypodium.— B. L. RoBInso¥; 
Gray Herbarium. 
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