434 Rydberg : Rocky Mountain flora 



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 fi-uit about I dm. long ; sepals oblong, yel- 

 lowish- or greenish-white, 4 mm. long ; petals white, clawed, 6-7 

 mm. long ; blades spatulate ; pedicels in fi-uit 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 ; ^tipe 1-2 mm. 

 long ; style short. 



This is related to PlcuropJiragma ijitcgrifoluim ( TJiclypodium 

 integnfoliiim Endl.), but differs in the shorter inflorescence, the 

 shorter pedicels, broadened at the base, the shorter pod with longer 

 stipe and shorter style. 



Utah: Moab, 1891, M. E. Jones (labeled Thclypodhim 

 W7'ightii, type in herb. N. Y. Bot. Garden). 



Arizona : 1876, E. Palme?-. 



To this genus belongs also Thelypodiiini lilaciiinm Greene, PI. 

 Baker. 3:9. 1 901, if distinct fi-om T. integrifoliuvi. The only 

 specimens at hand differ fi-om 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. 

 ThclypoduLin% Hcsperidanthiis B. L. Robinson, Syn. Fl. i' : 174. 



1895- 



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. 



Hesperidanthus linearifolius (A. Gray). 



Slreptanthus linearifoliiis K. Gray, PI. Fendl. 7. 1849. 



lodanthus or Paehypodnun lincarifoliuin A. Gray, Proc. Am. Acad. 



6: 187. 1863. 

 Thely podium linearifoliuDi S. Wats. Bot. King's Expl. 25. 1871. 



