434 RYDBERG: Rocky MounrAIN FLORA 
v Pleurophragma platypodum sp. nov. 
Glabrous perennial with a tap-root ; stem simple up to the in- 
florescence, 1-2 m. high; basal leaves spatulate, 5-10 cm. long, 
entire ; stem-leaves 3-6 cm. long, linear-lanceolate or oblanceo- 
late, dark-green, thick; inflorescence paniculate ; racemes dense, 
at first corymbiform, in fruit about 1 dm. long ; sepals oblong, yel- 
lowish- or greenish-white, 4 mm. long ; petals white, clawed, 6-7 
mm. long ; blades spatulate ; pedicels in fruit about 3 mm. long, 
divergent or somewhat reflexed, dilated and flattened at the base, 
pod 1.5-2 cm. long, I-1.5 mm. thick, torulose ; stipe 1-2 mm. 
long ; style short. 
This is related to Pleurophragma integrifolium ( Thelypodium 
integrifolium Endl.), but differs in the shorter inflorescence, the 
shorter pedicels, broadened at the base, the shorter pod with longer 
stipe and shorter style. 
Utan: Moab, 1891, M E. Jones (labeled Thelypodium 
Wrightit, type in herb. N. Y. Bot. Garden). 
ARIZONA: 1876, E. Palmer. 
To this genus belongs also 7, helypodium lilacinum Greene, PI. 
Baker. 3: 9. 1901, if distinct from T. integrifolium. The only 
specimens at hand differ from that only in the stronger purple 
color of calyx and corolla. They are without fruit, which, how- 
ever, may furnish distinctive characters. 
HESPERIDANTHUS (B. L. Robinson) Rydb., gen. nov. 
Thely podium § Tlesperidanthus B. L. Robinson, Syn. Fl. 1': 174. 
18 
Erect, slender, glabrous perennials, with pale foliage ; corym- 
bosely branched above. Basal leaves obovate, toothed ; stem- 
leaves linear, entire. Sepals rather firm, erect ; the outer strongly 
saccate at the base. Petals purple, with obovate blades. Anthers 
linear, sagittate at the base, strongly curved. Stigma conical or 
ovate, neither truncate nor 2-lobed. Pod terete, linear, short- 
stipitate. _ 
v Hesperidanthus linearifolius (A. Gray). 
Streptanthus linearifolius A. Gray, Pl. Fendl. 7. 1840. 
lodanthus or Pachy podium linearifollum A, Gray, Proc. Am, Acad. 
6: 187. 1863. 
Thely podium linearifolium S. Wats. Bot. King’s Expl. 25. 1871. 
