254 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
10. THALICTRUM L. Meapow Ruve. | 
Low or tall perennial herbs with alternate, twice or thrice ternately compound 
leaves, the petioles dilated at the base; inflorescence corymbose or paniculate, often 
polygamous or dicecious; sepals 4 or 5, petal-like, greenish, inconspicuous; petals 
none; achenes 4 to 15, grooved or ribbed or inflated. 
KEY TO THE SPECIES. 
Flowers perfect; plants zmall, 20 cm. high or less............... 1. T. cheilanthoides. 
Flowers dicecious or polygamous; plants large, 30 to 100 cm. high. 
Flowers polygamous; achenes not flattened, thick-walled; 
ribs thick, separated by acute grooves; cauline leaves 
Sessile... 2... ee eee cece cee eee e ee eeee 2. T. dasycarpum. 
Flowers dicecious; achenes flattened, thin-walled; ribs thin, 
separated by wide rounded grooves; cauline leaves 
petiolate. 
Leaflets very large, 20 to 40 mm. long; achenes symmet- 
rical or nearly s0................2.2-0eceeeeeeeee 3. T. occidentale. 
Leaflets seldom more than 15 mm. long, usually less; 
achenes asymmetrical. 
Leaflets large; achenes almost twice as long as broad; 
pedicels and fruit glandular................. 4, T. fendleri. 
Leaflets small; achenes but little longer than broad; 
pedicels and fruit usually glabrous. ......... 5. T. wrightit. 
1. Thalictrum cheilanthoides Greene, Leaflets 2: 89. 1910. 
Tyre Loca.iry: Pecos Baldy, New Mexico. Type collected by Standley (no. 4324). 
RanGeE: Known only from type locality, in the Arctic-Alpine Zone. 
This is possibly not distinct from 7’. alpinum L. 
2. Thalictrum dasycarpum Fisch. & Lall. in Fisch. & Mey. Ind. Sem. Hort. 
Petrop. 8: 72. 1841. 
Type Locauity: “‘Hab.in America boreali, ubi sub expeditione Frankliniana 
semina collecta sunt.’’ 
Rance: British America to northern New Mexico. 
New Mexico: Aztec (Grifin). Wet ground. 
8. Thalictrum occidentale A. Gray, Proc. Amer. Acad. 8: 372. 1872. 
Type Locatiry: Vancouver Island. 
Rance: British America to California and New Mexico. 
New Mexico: Four miles south of Tijeras (Herrick). Mountains, in the Transition 
Zone. 
4. Thalictrum fendleri Engelm. in A. Gray, Mem. Amer. Acad. n. ser, 4: 5. 1849. 
TYPE LocaLity: Damp, shady places in the mountains around Santa Fe, New 
Mexico. Type collected by Fendler (no. 13). 
Rance: Wyoming to Arizona and New Mexico. 
New Mexico: Carrizo Mountains; Tunitcha Mountains; Chama; Raton; Johnsons 
Mesa; Sierra Grande; Upper Pecos; Mogollon Mountains. Meadows and thickets in 
the mountains, Transition and Canadian zones, 
5. Thalictrum wrightii A. Gray, Pl. Wright. 2: 7. 1853. 
Thalictrum fendleri wrightii Trel. in A. Gray, Syn. Fl. 11: 16. 1895. 
TYPE Locality: Mountain ravine at Santa Cruz, Sonora, Mexico. 
Rance: New Mexico and Arizona and southward. 
New Mexico: North of Ramah; Pinos Altos Mountains; Luna; Wheelers Ranch; 
Hanover Mountain; Organ Mountains: White and Sacramento mountains. Moun. 
tains, in the Transition Zone. 
