Davis: THALICTUUMS OF NORTH AMERICA. 521 



other smaller teeth : panicles many-flowered, monoecious or 

 polygamous ; sepals whitish ; anthers linear, mucronate : akenes 

 5 to 7, sessile or nearly so, spreading, reticulately ribbed, glan- 

 dulous; styles long and filiform, rather persistent. June-Aug. 

 Oaxaca, southeastern Mexico (f). Closely allied to T. Her- 

 vandezii, 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 i line long, few-ribbed. Northern Ja- 

 lisco and western Zacatecas (f). Fruit much shorter than in T. 

 lanatum. 



T. tomentellum ROBINSON & SEAT. Proc. Am. Acad. 28 : 

 103. 1893. 



Stem striate, glandular, finely and densely pubescent through- 

 out : leaves 3 times pinnate on petioles i 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-dicecious ; 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 WATS. 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 dioecious ; 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 ROSE, 1. c. 188. 1899. 



Glabrous, slender, i foot or less high, from a cluster of thick- 

 ened roots : leaves small, sessile, once or twice ternate : leaflets 



