NORTH AMERICAN GERANIACEAE. 89 



Jacquin, whose illustrations otherwise well represent our exti-eme form of O. cornicu- 

 lata and its variety stricta, figures the former without stipules, and the latter with 

 rounded stipules, while the reverse is true.^ Elongated acute stipules, such as Salis- 

 bury^ and Sowerby^ figure, have not been observed in our specimens, but can readily 

 be conceived as resulting from the prolongation of the acute outer angle of such trun- 

 cated stipules as some of our plants possess. The pubescence of most forms of this 

 species consists of sj^reading or appressed unicellular pointed hairs, with thick verru- 

 cose walls, intermingled witli which are a very few l)lunt hairs consisting of a sino-le 

 row of smooth, thin-walled cells. In var stricta the pointed rough hairs are abundant 

 on the leaflets, pedicels, etc., but they are commonly less numerous on the lowei- part of 

 the stem and petioles. Where these are hairy (and they are extremely villous in some 

 plants growing in shaded places), the pubescence often consists almost exclusively of the 

 thin-walled hairs, which are often of unusual length, and easily show their septate char- 

 acter under a hand-lens; the same is sometimes true of the capsules. 



5. O. SuKSDORFii, n. sp. O. corniculata, Gray, Proc. Amer. Acad., viir, 378. Perennial 

 from a slender creeping rootstock, slender-stemmed, erect, a span or two hio-h, more or 

 less jiilose, or loosely villous; leaves estipulate, long-petioled, trifoliolate, leaflets deeply 

 oljcordate, with unequal lobes as much as 25 mm. wide; flowers mostly paired on lono- 

 axiUary peduncles, heterogone-trimorphic, bright yellow; bracts subulate; sepals obtuse, 

 downy ; petals thrice as long as the calyx, 15 mm. long, wavy-margined, not emargi- 

 nate. Fruit not seen, but presumably as in 0. corniculata. — In woods; Oregon (Nut- 

 tall, Hall, Henderson, Suksdorf) ; collected in June by Mr. Suksdorf. 



6. O. RECUiiVA, Elliott, Bot. S.Car. and Georgia, r, 526. Annual (?) or perennial from 

 a slender rootstock, erect, simple, 1-2 ft. high, glabrate or somewhat soft-villous; leaves 

 long-petioled, estipulate; leaflets large, as much as 60 mm. wide, broadly obcordate with 

 a shallow sinus, somewhat pubescent and ciliate, narrowly margined with broAvn-purple • 

 flowers mnbellate or suljcymose, 12-15 mm. long, yellow, brown-striate at base, hetero- 

 gone-trimorphic; otherwise similar to O. corniculata, var. stricta. — Open woods, etc. 

 Carolina {fide Elliott) ', to Pennsylvania (Carey), west to Ohio {Lea, Lloyd) Indiana 

 {fide Barnes, Bot. Gaz., ir, 21) and Tennessee {Oattinger). Flowering from May to 

 June or the early part of July. — PI. 11, fig. 6. 



Elliott based his description on the short-styled plant, Avliieh he says is "ver}^ common 

 near Charleston, intermingled with 0. stricta, with which it has been confounded." 

 Carey, whose specimens, so far as I have seen them, were all long-styled, regarded it as 

 O. Dillenii, from Avhich, however, it is quite distinct, judging from the figure, in Dil- 

 lenius's Hort. Ethel., ir, PI. 221, on which the latter is based, and a single flower of the 

 original of the figure, kindly secured for me, at Oxford, by Dr. Gray. Lea, who appears 

 to have studied it carefully about Cincinnati, contributed a suite of specimens, repre- 

 senting the three forms of flowers, to Torrey, but was apparently misled into considering 

 the length of stamens and pistil merely variable, trimorphic heterogony not havino- then 

 been discovered. I am indebted to Mr. C. G. Lloyd for a suite of specimens from the 

 vicinity of Cincinnati. 



' Oxalis Monogr., PI. 4-5. = English Bot , PI. 1720; Third ed., PI. 321. 



= Trans. Liuu. Soc, il, PI. 23, flg. 5. 



