268 COlSTTEIBUTIOIvrS FEOM THE NATIONAL HEEBAEIUM. 



2. Pleurophragma gracilipes (Robinson) Rydb. Bull. Torrey Club 34: 433. 1907. 



Thelypodium integrifoUum gracilipes Robinson in A. Gray, Syn. Fl. 1^: 176. 1895. 



Type locality: Southwestern Colorado. 



Range: Southwestern Colorado to northern Arizona and northwestern New Mexico. 



New Mexico: Can-izo Mountains; Cedar Hill. Wet ground, in the Upper Sonoran 

 and Transition zones. 



6. THELYPODIUM Endl. 



Slender glabrous biennial about 40 cm. high, with triangular-lanceolate auriculate- 

 clasping leaves and elongated racemes; petals white, purplish-tinged, 5 mm. long or 

 less; pods slender, 4 to 6 cm. long, somewhat divergent, arcuate; septum without a 

 midrib; style truncate. 



1. Thelypodium vernale Woot. & Standi. Contr. U. S. Nat. Herb. 16: 128. 1913. 



Type locality: Low mountains west of San Antonio, Socorro County, New Mexico. 

 Type collected by Wooton (no. 3847). 



Range: Known only from the type locality, in the Upper Sonoran Zone. 



7. HETEROTHRIX Rydb. 



Slender biennials, pubescent below -with stellate or branched hairs; basal leaves 

 oblanceolate, toothed; cauline leaves lance-linear or linear, entire; racemes elongated, 

 slender; calyx somewhat oblique, the lower sepals longer than the upper, all ascend- 

 ing; .petals spatulate, indistinctly clawed; pods slender, terete, sessile; stigma min- 

 ute, entire or slightly lobed. 



key to the species. 



Sepals 3 mm. long or less, mostly green; siliques 20 to 35 mm. long, 



erect or ascending 1. H. viicrantha. 



Sepals 4 to 5 mm. long, purple; siliques 50 to 70 mm. long, widely 



spreading 2. H. longifolia. 



1. Heterothrix micrantha (A. Gray) Rydb. Bull. Torrey Club 34: 435. 1907. 

 Streptanthus micranthus A.. Gray, Mem. Amer. Acad. n. ser. 4: 7. 1849. 

 Thelypodium micranthum S. Wats. Proc. Amer. Acad. 17: 321. 1882. 



Type locality: Margins of Santa Fe Creek, New Mexico. Type collected by 

 Fendler (no. 23). 



Range: Colorado to Arizona and western Texas, southward into Mexico. 



New Mexico: Santa Fe and Las Vegas mountains; Mogollon Mountains; Black 

 Range; Organ Mountains. Damp slopes, in the Transition Zone. 



2. Heterothrix longrfoUa (Benth.) Rydb. Bull. Torrey Club 34: 435. 1907. 

 Streptanthus longifolius Benth. PI. Hartw. 10. 1839. 



Thelypodium longifolium S. Wats, in King, Geol. Expl. 40th Par. 5: 25. 1871. 



Type locality: Mexico. 



Range: New Mexico and Arizona to Mexico. 



New Mexico: Santa Fe and Las Vegas mountains; Tunitcha Mountains; La Jara; 

 Sandia Mountains; Mogollon Mountains; Black Range; Wliite and Sacramento moun- 

 tains; Capitan Mountains. Transition Zone. 



8. EUKLISIA (Nutt.) Rydb. 



Annual or biennial herbs with glabrous glaucous leaves, the basal more or less 

 toothed, the cauline linear to cordate-clasping; flowers rather large, 1 cm. long or 

 less, in elongated terminal racemes; calyx urceolate; petals long-clawed, the blades 

 undulate-crisped; anthers sagittate; siliques 5 to 7 cm. long or less, flattened parallel 

 to the partition ; seeds winged . 



