OF ARTS AND SCIENCES. 375 



phinifoUus ? Torr. & Gray, not Hook. The typical form narrow- 

 leaved, but passing freely into 



Var. LATiLOBUS, a common coarse-leaved and more robust form. 

 B. Ludovicianus, Greene, Bull. Calif. Acad. ii. 58. 



o o Strictly erect species, nat. from Europe : no stolons : very short 

 styles stigraatic for all or most of their lengtli : petals 5, broad. 



R. ACRis, L. Possibly native in Nevirfoundlaud, as it is thought to 

 be in Greenland. 



R. BULBOSUS. Sparingly naturalized in most of the Eastern 

 Atlantic States, copiously so in Eastern New England. 



o o o Erect or ascending, not stoloniferous, o-petalous : stout subu- 

 late style stigmatose for much of its length, persisting in a straight 

 or merely oblique beak: roots fibrous, of short duration. 



R. Pennstlvanicus, L. f. Well marked by its stout and tall up- 

 right leafy stem, annual or subannual root, rough-hirsute and widely 

 spreading pubescence, ternately dissected leaves with petiolulate leaf- 

 lets, petals not surpassing the reflexed calyx, and spicate (oblong or 

 cylindraceous) head of short-beaked akenes. 



R. HiSPiDUS, Michx., partly, DC, Hook. Ascending or declined, 

 usually but not always hispidly hirsute with spreading hairs, annual or 

 biennial,or sometimes perhaps more enduring (the fascicled roots either 

 slender or thickening) : stems few-leaved, when reclining rarely if ever 

 rooting : leaves all ternately compound : leaflets mostly slender-petio- 

 lulate in the manner of the preceding species, and of similar sub- 

 division : peduncles rather long : petals obovate, mostly 3 lines long, 

 surpassing the spreading or hardly reflexed and early deciduous calyx : 

 akenes mostly a line and a half long, and with stout and straight 

 (about half a line long) beak formed of the whole flat subulate style : 

 head globular or at most oval. — Has been confounded with the pre- 

 ceding species, to which it is most related, and with R. septentrionalis, 

 as well as with the true R. repens. But it has not the truly pcreimial 

 roots of either, nor has it the creeping stolons of the one or the 

 slender-tipped styles of the other. This is a Northern and Western 

 species, extending from Canada to the Pacific coast and south to Colo- 

 rado and Utah. The character " stylo brevissimo " marks it as tlie 

 plant which De CandoUe took up in Michaux's herbarium, and that 

 probably came from Canada, while the other specimen, which De Can- 

 doUe dt scribed as his R. Caroliniomis, would be the one to which 

 Michaux's habitat " Carolina; Inferioris " belongs. We therefore cite 

 R. hispidns, Michaux, Fl. i. 321, partly; DC. Syst. i. 289 ; Hook. Fl. 



