268 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
2. Pleurophragma gracilipes (Robinson) Rydb. Bull. Torrey Club 34: 433. 1907. 
Thelypodium integrifolium gracilipes Robinson in A, Gray, Syn. Fl. 11: 176. 1895. 
Tyre LocaLity: Southwestern Colorado. 
RanaeE: Southwestern Colorado to northern Arizona and northwestern New Mexico. 
New Mexico: Carrizo 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. & Standl. 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). 
RanaE: 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. ....... 2.00.2 cece cece cence cece nace 1. H. micrantha. 
Sepals 4 to 5 mm. long, purple; siliques 50 to 70 mm. long, widely 
spreading..... 22.2.2... ee eee ce eee cee cece ence 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 8. Wats. Proc. Amer. Acad. 17: 321. 1882. 
Type Locatity: Margins of Santa Fe Creek, New Mexico. Type collected by 
Fendler (no. 23). 
Rance: 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 longifolia (Benth.) Rydb. Bull. Torrey Club 84: 435. 1907. 
Streptanthus longifolius Benth. Pl. Hartw. 10. 1839. 
Thelypodium longifolium S. Wats. in King, Geol. Expl. 40th Par. 5: 25. 1871. 
Type Locauity: Mexico. 
Rana@e: New Mexico and Arizona to Mexico. 
New Mexico: Santa Fe and Las Vegas mountains; Tunitcha Mountains; La Jara; 
Sandia Mountains; Mogollon Mountains; Black Range; White 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 em. 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. 
