Davis: THALICTRUMS OF NORTH AMERICA. 521 
other smaller teeth: panicles many-flowered, moncecious or 
polygamous; sepals whitish ; anthers linear, mucronate: akenes 
5 to7, sessile or nearly so, spreading, reticulately ribbed, glan- 
dulous ; styles long and filiform, rather persistent. June—Aug. 
Oaxaca, southeastern Mexico (+). Closely allied to 7. Her- 
nandezit, but differing in being glandular hispid, and having no 
convex protuberances on the akenes. 
T. papillosum Rose, 1. c. 189. 1899. 
Low, hairy: leaves small, 3 times ternate; leaflets roundish, 
often cordate at base, somewhat 3-lobed, papillose above, hairy, 
veins prominent beneath: panicles short; pedicels becoming re- 
flexed in fruit: akenes 1 line long, few-ribbed. Northern Ja- 
lisco and western Zacatecas (¢). Fruit much shorter than in 7. 
lanatum. 
T. tomentellum Rosinson & Seat. Proc. Am. Acad. 28: 
Fog. -EOO3. 
Stem striate, glandular, finely and densely pubescent through- 
out: leaves 3 times pinnate on petioles 1 to 2 inches long; leaflets 
suborbicular, subcordate, shallowly 3-lobed; the lobes rounded, 
often with 2 to 3 rounded teeth: flowers in a pyramidal subnaked 
panicle, polygamo-diccious; pedicels becoming reflexed in 
fruit: sepals 2 lines long; anthers setiform at tip: carpels about 
10, scarcely stipulate, woolly, roughly reticulated, acuminate ; 
style very long, filiform, often deciduous. July. About Lake 
Patzcuaro, Michoacan (f). 
T. pinnatum Wars. Proc. Am. Acad. 23: 267. 1888. 
Hardly 2 feet high, glabrous and glaucous, slender: root 
fascicled, tubero-fibrous : leaves lanceolate in outline, 2% inches 
long or less, very shortly petioled, pinnate with about 7 (or 
fewer) pairs of divisions, the lower divisions ternate, with small 
lobed leaflets, the upper reduced to a single 3-lobed leaflet: 
flowers dicecious: sepals of the fertile flowers very small; stig- 
mas short and rather thick: akenes ovate, about one line long, 
undulately ribbed, the oval seed filling the cavity. September. 
Pine plains, east base Sierra Madre, Chihuahua. Description 
from the original (f). 
T. Madrense Ross, |. c. 188. 1899. 
Glabrous, slender, 1 foot or less high, from a cluster of thick- 
ened roots: leaves small, sessile, once or twice ternate: leaflets 
