1886.] 301 [Trelease. 



odor it is T. graveolens, Muhl. Fl. Lancast. Mss., which is var. 

 ceriferum, Austin, of the Manual. With strongly revolute margins 

 to the leaflets, it is T. revolutum, D C. Syst. i, 173; Lecoyer, 

 Monogr. Thalict. 71. With pubescent achenia it becomes T. dasy- 

 carpum, Fisch. Mey. and Lall. Index Sem. Hort. Pet. 72, Le- 

 coyer, Monogr. 70, which approaches the next species in its shorter 

 anthers and wide, papillately roughened filaments. A thin-leaved 

 form from Louisiana (Hall) and Indian Territory (Palmer), with 

 very long, slender stigmas is T. macrostigma, Torrey in herb., 

 which is approximated to the type by shorter-styled Arizona plants 

 collected by Rusby. A questionable thick-leaved specimen from 

 Fremont's Expedition of 1842 has also elongated stigmas. 



6. T. polygamum, Muhl. Fl. Lancast. 176. T. cornuti of Gray's 

 Manual, etc. T. corynellum, DC. of Lecoyer. (Cf. Gray, Am. 

 Journ. Sc. Mar. 1886, 235-6.) — Of the general appearance of the 

 last (rarely 6-8 ft. high) but with smaller leaves and leaflets. 

 Flowers commonty andro-dioecious, more corymbosely clustered on 

 the branches of the panicle, appearing smaller but more conspic- 

 uous in the male plants, from the crowded erect stamens, with 

 white filaments broader than the oval, blunt or barely mucronate 

 anthers that scarcely exceed 1 mm. in length. Achenia as in T. 

 purpurascensbut mostly narrower and longer-stalked, rarely pubes- 

 cent. Stigma typically shorter and broader. — New Brunswick to 

 Florida; west to Ohio. 



Glabrous or pubescent, but not glandular. A conspicuously 

 downy form is T. pubescens, Nutt. 



1 am indebted to Professor Goodale for the privilege of exam- 

 ining the large series of duplicate specimens of this and the pre- 

 ceding, collected in Connecticut by the late Charles Wright, who 

 worked at them diligently for several years. So far as I have been 

 able to observe, T. polygamum is never glandular, so that all spec- 

 imens with glandular pubescence are apparently referribie to T. 

 purpurascens ; but I am unable to identify with certainty fertile 

 plants that possess no stamens, when this character is wanting. 

 Even when stamens are present they are not always satisfactory, 

 for doubtful specimens occasionally occur with pointed anthers 

 nearly 2 mm. long, and widened filaments. These are apparently 

 forms of T. purpurascens, var. dasycarpum. 



Certain specimens which resemble T. dioicum in having thin, 

 glabrous (rarely sparingly pubescent), pale leaflets, rounded and 

 round-lobed at the apex, but with the fruit stipitate, 2-edged and 



