372 PROCEEDINGS OF THE AMERICAN ACADEMY 



h. Pacific-coast species, large-flowered, long-styled, perennial. 



R. Bloomeri, Watson, Bot. Calif, ii. 426 ; found only in low 

 grounds on San Francisco Bay. To this well-marked species may 

 probably be referred R. Chilensis, Hook. & Arn. Bot. Beech. 134. 



c. Chiefly Eastern N. American or cosmopolite, small-flowered, very 

 short-styled ; with compressed and small very short-beaked or beak- 

 less akenes, and slender-fibrous roots : biennial, or short-lived per- 

 ennial, or, at least in the second species, annual. 

 R. ABORTivus, L., which passes freely into var. micranthus. Gray, 

 Man. 42 (A\ micrmithus, Nutt., with hairy stems and some divided 

 root-leaves), not smaller-flowered than the type. Connects with 



Var. Hauveyi, which produces conspicuous petals, even 3 lines 

 long, and very much surpassing the calyx. — On damp rocks in 

 Arkansas, F. L. Harvey and Dr. Hass. 



R. SCELERATUS, L. In the Eastern United States this has the look 

 of an introduced plant, but doubtless indigenous in the interior, where 

 it has a wide range. 



= == ^ = = Leaves variously cleft or divided : akenes compressed, 

 generally flat, surrounded by a firm or indurated margin : none 

 truly alpine or arctic. 

 a. Perennials with globular or ovoid carpel-heads (/?. Pennsylvaniciis 

 and perhaps R. hispidus excepted), the akenes smooth or in some 

 barely pubescent : mostly fibrous-rooted. 

 1. Hook- styled ; the long styles recurving (at least in age) and wholly 

 persistent in a rigid and uncinate elongated beak : petals only 5 : 

 stems erect : radical leaves hardly ever divided into separate leaf- 

 lets. — Oncostyli, Gray, Proc. Am. Acad. viii. 373, excl. spec. 1. 

 R. RECURVATUS Poir. Petals reflexed with and shorter or hardly 

 longer than the reflexed calyx : akenes glabrous, but their receptacle 

 hairy. — R. lanuginosus, Spreng., not Poir. R. samculaformis, Muhl. 

 R. (omentosus, Spreng., not Poir. — An Eastern species, extending 

 westward to the Lake of the Woods. 



R. occiDENTALis, Nutt. To this wholly AVestern species — widely 

 ranging geographically and in diversity — I am now constrained to 

 join R. Mlsonii, Gray, Proc. Am. Acad. viii. 374 {R. reciirvatus, var. 

 Nelsoni, DC. Syst. i. 290) ; indeed, Nuttall's plant, now known in bet- 

 ter original specimens, proves to be essentially that which I had taken 

 as the type of R. Nelsonii. It is also, I believe, R. Schlechtendalii, 

 Hook., Fl. i. 21 (although the fruit of that is unknown), as to the 



