Trelease.] 304 [March 17, 



high, in foliage and habit intermediate between T. occidentale and 

 T. sparsiflorum. Granular or glandular-pubescent. Lower leaves 

 petioled, the stalked remote leaflets often deeply cordate, with 

 three divergent lobes, the central or all of them again lobed, their 

 divisions mostly pointed. Flowers dioecious. Stamens numerous, 

 their slightly dilated filaments often papillose-roughened above ; 

 anthers linear, 2-3 mm. long, mucronate. Achenia ten or less 

 (only a portion of the carpels reaching maturity), snbstipitate, 

 4-6mm.long, scarcely reflexed, obliquely oval or with the dorsal su- 

 ture stiaightish, thin-walled, flattened, with 8-10 prominent nearly 

 parallel ribs, the median heaviest ; not filled by the oblong or linear 

 seed. — Mountains, Texas to California, New Mexico and Colorado. 



Var. Wrightii, T. Wrightii, Gray, Plant. Wright, part 2, 7, has 

 usually smaller 3-4-angled plump achenia, more or lessreticulately 

 nerved and nearly filled by the oblong thick seed ; and, commonly, 

 smaller leaflets, very puberulent below. — Arizona and New Mexico. 



Var. platycarpum has stricter panicles and dilated, sparsely 

 glandular, erect achenia, 4-6 mm. long and as much as 4 mm. 

 broad, often long-acuminate and somewhat free-veined ; otherwise 

 as in the type. — California. 



12. T. polycarpum, Watson, Proc. Am. Acad, xiv, 288. — Foli- 

 age and habit of T. Fendleri, but glabrous throughout, with the 

 leaflets longer-pointed and the flowers in stricter panicles. Achenia 

 usually large, numerous in a dense globose head, obovoid, turgid 

 (flat and undulate when dry), tapering into reflexed stipes; their 

 thin walls with free or anastomosing low veins. Seed slender. 

 — California. 



The following Mexican species are recognized by Lecoyer, in his 

 monograph above referred to: — T. Hernandezii Tausch. (p. 46), 

 T. lanatum, Lee. (47), T. peltatum, DC. (49), T. pubigerum, 

 Benth. (50), T. Galeottii, Lee. (56) and T. gibbosum, Lee. (57) ; 

 but there is no indication that any of them occur on this side of the 

 boundary. 



EXPLANATION OF PLATE I. 



DETAILS OF THALICTEUM. 



1, T. clavatum. 2, T. sparsiflorum. 3, T. alpinum. 4, T. minus. 5, 

 T. polygamum. 6, T. purpurascens ; a, pistil of var. macrostigma. 7, T. 

 debile. 8, T. dioicum. 9, T. venulosum. 10, T. occidentale (?) , shorter form 

 of fruit. 11, T. Fendleri. 12, T. Fendleri, var. Wrightii. 13, T. Fendleri, 

 var. platycarpum. 14, T. polycarpum ; a, smaller-fruited form. — Figures 

 2-4 are enlarged 3 diameters ; the others, 5. 



