4, EANUNCULACE.SJ. 



6. R. Californicus, Benth. Erect or decumbent, 1 — 2% ft. high, 

 freely branching and many-flowered: petals 10 — IS, obovate-oblong, 

 4—5 lines long: achenes much flattened, 1% lines long, the beak short, 

 recurved; head dense, globose. Var. laetus, Greene. Strictly erect, 

 stoutish and fistulous, hirsute, glaucescent below; herbage light green; 

 leaflets much dissected. Var. canescens, Greene. Low and stout, the 

 basal parts canescently long- villous: leaves less dissected: fl. large 

 (fully 1 in. broad). Var. cnneatns, Greene. Slender, decumbent, the 

 growing parts silky-pubescent: leaves cleft into 3 cuneate lobes or 

 segments, these incisely toothed: fl. small: achenes very many, in a 

 dense round-ovoid head. — Type abundant on open hills. Var. Iseius, in 

 lowlands not far from salt marshes. Var. canescens, in the Oakland 

 Hills southward, towards Livermore. Var. cuneatus, on the San Fran- 

 cisco peninsula southward. Feb. — June. 



7. R. occidentalis, Nutt., var. Eiseni, Gray. Distinguished from 

 the last by more slender habit, broad leaf-segments, small petals, always 



5, and broader thinner achenes. Var. Rattani, Gray. Achenes smaller, 

 hairy and papillose. — Higher hill country both north and south of the 

 Bay, on dry open or sparsely wooded slopes. April, May. 



8. R. canus, Benth. Stout and tall, with the habit of R. Calif ornicus 

 but herbage more or less silky-canescenl; leaves cut into narrow acute 

 segments; petals 5 only, round-obovate. — Hills near Antioch. April, May. 



9. R. hebecarpns, Hook. & Arn. Slender, erect, leafy, 5—15 in. high, 

 pilose-pubescent: radical leaves rounded or reniform, deeply lobed or 

 cleft, the segments 3-lobed: fl. minute, on filiform pedicels : achenes few, 

 rounded, flattened, papillose and short-hairy, the beak very short, 

 recurved.— Moist shades among the lower hills; not common. April, May- 



10. R. mukicatus, L. Stout and fistulous, yellow-green, glabrous: 

 leaves round-reniform, slightly lobed: fl. small: achenes very large, with 

 stout ensiform beak and coarsely muricate-prickly sides. — Rather common 

 in wet soils, especially on the outskirts of San Francisco; naturalized 

 from Europe; flowering throughout the year. 



* * * Aquatics; leaves mostly capillaceous-multijid and submersed; petals 



while, with naked nectariferous pit; achenes little flattened, 



transversely rugose. 



11. R. aqnatilis, Dodoens. Perennial, the emersed and floating 

 leaves, when present, roundish, 3-lobed: styles subulate; achenes slightly 

 rugose, usually hispidulous, 12—20 in a compact globose head.— Common 

 in ponds; sometimes terrestrial on muddy shores. May— Dec. 



12. R. Lobbii, Gray. Annual; floating leaves always present, deeply 

 3-lobed, the middle lobe usually elliptical and^ entire, the laterals larger, 



