MUSTARD FAMILY 365 



oled, with usually hastate blades. Sepals greenish, ascending. Petals greenish 

 white, with short claws and lanceolate dentate blades. Anthers sagittate at the 

 base, linear-oblong, at last curved, greenish. Pod slender, somewhat torulose, 

 short-stipitate and short-styled; stigma minute, entire. 



1. C. hastatus (S. Wats.) Rydb. Perennial; stem glabrous, terete, 6-10 

 dm. high, simple or branched above; leaves petioled; blades of all except the 

 uppermost leaves hastate, glabrous, thin, 5-12 cm. long; flowers drooping or 

 horizontal; petals 5-6 mm. long; pod terete, 6-9 cm. long; stipe and style about 

 2 mm. each. Caulanthus hastatus S. Wats. Canons and mountain valleys: 

 Ore. — Utah. Submont. — Mont. Je-Jl. 



47. SCHOENOCRAMBE Greene. 



Glabrous perennials or slightly pubescent, with creeping rootstocks. Flow- 

 ers perfect in elongate racemes. Sepals slightly saccate at the base. Petals 

 light yellow, rather large. Pods sessile, linear-cylindrin. Stigmas nearly cir- 

 cular, but 2-lobed. Anthers sagittate at the base. Cotyledons incumbent. 



Plant tall, 3-6 dm. high, glabrous. 

 Leaves all linear, entire. 



Plant decumbent, slender; pods ascending, more or less arcuate; style about 1 mm. 

 long. 1. S. decumbens. 



Plant erect, stouter; pods erect or nearly so, straight; style obsolete. 0..5 mm. or 

 less long. 2. S. linifolia. 



Some of the leaves pinnatifld. 3. S. pinnata. 



Plant low, 1-2 dm. high, pubescent; leaves pinnatifld. 4. S. pygmaea. 



1. S. decumbens Rydb. Perennial; stems slender, decumbent, 2-3 dm. 

 long, as well as the whole plant perfectly glabrous, more or less branched; leaves 

 2-6 cm. long, 1-3 mm. wide, glaucous; petals yellow, 6-7 mm. long, spatulate or 

 oblanceolate; pods 3-4 cm. long, about 0.75 mm. in diameter. Plains and hills: 

 Mont. — Colo. — -Utah. Plain — Submont. Je-Au. 



2. S. linifolia (Nutt.) Greene. Stems erect, glabrous, or with a few hairs 

 at the base; leaves glabrous, 4-7 cm. long; petals yellow, spatulate, 8 mm. long; 

 pod erect on ascending pedicels, 3-5 cm. long, 1 mm. thick. Sisymbrium lini- 

 folium Nutt. Dry plains: Mont.— N.M.— Utah— B.C. Son.— Submont. My- 

 Je. 



3. S. pinnata Greene. Stems simple, 3-5 dm. high; lower leaves pinnatifld, 

 with oblong to linear divisions, glabrous and glaucous, the upper linear and 

 entire; petals light yellow, 7-10 mm. long; pod 5-6 cm. long, 1 mm. thick, erect 

 on ascending pedicels. Plains and hills: Mont.— Colo.- — -Utah — Wash. Son. — • 

 Submont. My-Jl. 



4. S. pygmaea (Nutt.) Greene. Stem low, about 1 dm. high, sparingly 

 pubescent; leaves except the uppermost pinnatifld, with lanceolate or Unear 

 divisions; petals yellow, about 6 mm. long, spatulate. Dry soil: Mont. 



48. THELYPODldPSIS Rydb. 



Biennials, with rather thick and glaucous foliage and glabrous except the 

 lower part of the stem. Basal leaves spatulate or oblanceolate; stem-leaves 

 auriculate-clasping with rounded auricles. Sepals thin, erect or ascending, not 

 gibbous. Petals more or less clawed, white or purplish or in one species yellow. 

 Anthers long, linear, sagittate at the base, soon spirally curved. Pod slender, 

 terete, more or less torulose, usually with a short stipe and style; stigma 2-Iobed, 

 the lobes expanded over the septum; cotyledons obliquely incumbent. 



Stipe very short, less than 1 mm. long or almost none; petals white or tinged with purple. 

 Style 2 mna. or nearlj so. 



Pod 7-9 cm. long. 1. T. elegans. 



Pod about 4 cm. long. 2. T. Bakeri. 



Style less than 1 mm. long; pod 5-7 cm. long. 3. T. wyomingensis. 



Stipe 2-5 nam. long; petals and sepals yellow. 4. T. aurea 



1. T. elegans (M. E. Jones) Rydb. Stem 6-15 dm. high, erect, simple or 

 branched, glabrous or sUghtly hairy below; basal leaves oblanceolate or spatu- 

 late, dentate, 2-4 cm. long; stem-leaves ovate or lanceolate; petals 8-10 mm. long, 



