CRUCIFERAE (MUSTARD FAMILY) 211 



toothed on the sides: siliques spreading, somewhat knotted. (Chlorocrambc 

 hastatus Rydb. Bull. Torr. Bot. Club 34: 435. 1904.) Eastern Utah (probably 

 adjacent Colorado and Wyoming) to Oregon. 



5. STREPTANTHUS Nutt. 



More or less branching usually glaucous annuals, biennials, or perennials, 

 with leaves generally sagittate and clasping, and racemed white, purple, or yel- 

 low flowers. Calyx ovoid or by the spreading of the tips of the sepals flask- 

 shaped. Petals usually narrow, linear, or with a well-developed blade and a 

 channeled claw. Anthers long, sagittate. Silique oblong to linear, flattened. 

 Pubescence, if any, simple. 



Annual; leaves not clasping 1. S. longirostris. 



Perennials; leaves clasping. 



Leaves very obtuse; siliques broadly linear . . . . . 2. S. cordatus. 



Leaves acute; siliques subterete. 



Siliques stipitate . . . . . . . . . 3. S. coloradensis. 



Siliques not stipitate . . . . . . . . 4. S. wyomingensis. 



1. Streptanthus longirostris Wats. Proc. Am. Acad. 25: 127. 1889. Gla- 

 brous and glaucous annual, branching above, 2-5 dm. high: radical leaves 

 ovate-spatulate, soon deciduous; cauline linear to narrowly oblanceolate, 

 entire or sparingly toothed : flowers spreading or reflexed : petals white, about 

 5 mm. long: silique linear, attenuate to the slender style that points it, re- 

 flexed on short pedicels: seeds elliptical, winged. Colorado and Wyoming 

 to Washington. 



2. Streptanthus cordatus Nutt. T. & G. Fl. N. A. 1: 77. 1838. Glabrous 

 or glaucous: stem simple, 2-5 dm. high, rather stout: leaves thick, usually 

 repandly toothed toward the apex, the teeth often setosely tipped; lower 

 leaves spatulate-ovate or obovate, cauline cordate to oblong or ovate-lanceo- 

 late: petals about half longer than the sepals, greenish-yellow to purple: 

 siliques broadly linear, 5-10 cm; long, spreading. Colorado and Wyoming 

 to the Sierra Nevada. 



3. Streptanthus coloradensis A. Nels. Sparsely ciliate-hirsute, especially 

 below: stems several from the crown of a biennial or perennial root, ascend- 

 ing, 1-3 dm. long: radical leaves obovate-spatulate, sharply serrate around 

 the summit, short-petioled, ovate-lanceolate, clasping-auricled, 1-3 cm. long: 

 flowers white, crowded at first, the raceme much lengthened in fruit: sepals 

 linear, acute, half as long as the obovate-spatulate petals: silique linear, 6-9 

 cm. long, ascending, somewhat torulose, attenuate to a beak 3-5 mm. long; 

 the stipe slender, about 5 mm. long, half as long as the slender pedicel. (Euk- 

 lisia crassifolia Rydb. Bull. Torr. Bot. Club. 33: 142. 1906; not S. crassifolius 

 Greene, Pitt. 3: 227. 1897.) Western Colorado. 



4. Streptanthus wyomingensis A. Nels. Bull. Torr. Bot. Club 26: 126. 1899. 

 Glabrous or nearly so, branched from the base: stems simple or branched, 

 3-4 dm. high: radical leaves laciniate-toothed, obovate, short-petioled; cau- 

 line clasping-auriculate, from coarsely dentate to entire above: flowers large, 

 numerous: sepals oblong, half as long as the white or pinkish petals; claw of 

 petal long and narrow, the blade oval: silique linear, sessile, not beaked, 

 ascending, 6-10 cm. long, on stout pedicels. Western Wyoming to Utah. 



, 6. SUBULARIA L. AWLWORT 



A dwarf stemless aquatic, with tufted subulate leaves and few minute 

 white flowers in a loose scapose raceme. Sepals ovate, obtuse. Petals oblong 

 or spatulate. Stigma sessile. Silique slightly flattened, elliptic or oval; the 

 seeds in 2 rows. 



1. Subularia aquatica L. Sp. PI. 642. 1753. Growing in tufts in shallow 

 water of cold lakes or on the muddy shores: leaves glabrous, terete, shorter 

 than the scapes: floVers scattered: sepals and petals subequal: silique some- 



