MUSTARD FAMILY 329 



7. T. purpurascens Rydb. Stems generally several, less than 1 dm. high; 

 basal leaves oval or broadly spatulate, 2-3 cm. long, petioled, usually more or 

 less sinuate-dentate; stem-leaves ovate, obtuse, with a truncate base, closely 

 sessile; petals about 6 mm. long; pod triangular-obovate, distinctly wmged above, 

 7-8 mm. long. Alpine peaks: Colo.— Utah— Ariz.— N.M. Subalp.—Alp. 

 My-Jl. 



5. BURSA Weber. Shepherd's Purse. 



Annual caulescent herbs, pubescent with branched hairs. Leaves alternate* 

 entire, lobed, or pinn'atifid. Flowers perfect, in elongate racemes. Petals 

 white, spatulate. Stamens free and unappendaged. Styles almost none; 

 stigma smiple. Pod strongly flattened contrary to the narrow septum, cuneate 

 or obcordate, more or less deeply notched at the apex, the valves boat-shaped. 

 Seeds numerous in each cavity, marginless. Cotyledons accumbent. 



1. B. Bursa-pastoris (L.) Britton. Annual or winter biennial; stem 1-5 

 dm. high; lower leaves usually lyrate-pinnatifid, lobed or merely dentate; stem- 

 leaves sessile, hastate or sagittate at the base; petals w^hite, 2 mm long, spatu- 

 late; pods 6-8 mm. long, triangular. Capsella Bursa-pastons Medic. VVaste 

 places: Lab.— Fla.— Calif.— B.C.; S. Am.; nat. from Eurasia. Plain— bubaip. 



Ja-D. 



6. HUTCHINSIA R. Br. 



Low spreading annuals, minutely stellate or glabrous. Leaves alternate, 

 entire to pinnately lobed. Flowers perfect, in at last elongate racemes. Stigma 

 sessile. Petals minute, narrow, white. Pods strongly flattened contra^ to 

 the narrow septum, elliptic, not at all obcordate or notched at the apex, beeds 

 numerous in each cell. Cotyledons accumbent. 



1. H. procumbens (L.) Dev. Stems branched at the base, slender, 

 5-20 cm. long; lower leaves pinnatifid, lobed, toothed, or entire, minutely stellate; 

 upper leaves entire, oblanceolate or linear; sepals and petals about 1 mm. long, 

 fruiting pedicels divaricate; pod elliptic, about 4 mm. long. Moist ground: 

 Lab.— Xewf.— Colo.— Calif.— B.C. Plain— Suhmonl. Mr-Je. 



7. SMELOWSKIA C A. Meyer. 



Low cespitose perennials, with a suffruticose caudex and cinereous stellate 

 pinnatifid leaves. Flowers perfect, racemose. Sepals subequal, somewhat 

 spreading. Petals obovate, exserted, white or ochroleucous or tmged witn 

 purple. Pod lanceolate or ovate, more or less obcompressed; valves strongly 

 keeled. Stigma sessile. 



Basalleaves merely lobed, cuneate to oblanceolate in outline; pod 5-6 mm. long, tapering 

 towards the base. " ^- ^- '*'°°"'- 



'"prd^ilSn^Ta^Tng, obtuse at the base: calyces and Pedicels densely jillous; 



leaves white-villous. , . • ^ „o^>, ^t^h 



Pod lanceolate or oblanceolate, 7-12 mm. long, tapermg at each ena „^„ricana 



Segments of the basal leaves spatulate or oblong. i. ^- H^Yarilobd 



Segments of the basal leaves Unear or hnear-oblong. 4, Ca. nncaniooa. 



1. S. lobata Rydb. Stems 1 dm. or less high; stem-leaves pinnatifid ; sepals 

 densely viUous, 3 mm. long, ovate, acute; petals white, clawed, rounded-obovate, 

 pod gfabrous, about 5-6 mm. long, oblanceolate; style very short. High moun- 

 tains: Alta. — Mont. Subalp. Je-Jl. 



2. S. ovalis M. E. Jones. Stems about 1 dm high, densely white-viUous 

 and stellate; basal leaves floccose-stellate, pinnately divided m to 5-7 oblong, 

 entire, or 2-3-cleft divisions; petals clawed, with rounded-obovate blades, pods 

 obtuse at the base. High mountains: Wash.— Alta.— Calif. Mont.— Subalp. 

 Jl-Au. 



3. S. americana Rydb. Stems 1-2 dm. high; leaves finely but not densely 

 steUate; petals long-clawed, spatulate; pod 7-12 mm. long, tapermg at both 

 ends. High mountains: Mont.— Colo.— Utah— Ida. Mont.— Alp. Je-Jl. 



4. S. lineariloba Rydb. Stems about 1 cm. high, few-leaved; leaves 2 o 

 cm. lone, finelv stellate, the netioles also ciliate; petals clawed, 5-6 mm. long. 



