trautvetteria. RANUNCULACE.E. 13 



BATRACHIUM. 



oid. Petals none. Pistils numerous, capitate, becoming inflated, 

 4-angled membranaceous achenes. 



T. grandis Nutt. in T. & G. Fl. i, 37. Stem slender, 1-3 feet high: 

 leaves few, thin, radical long-petioled, cauline short-petioled, all deeply 5- 

 7-lobed with irregularly laciniate-toothed, acuminate lobes ; flowers white : 

 achenes a little more than a line long, broadly gibbous at base, rather abr- 

 uptly beaked by the slender revolute style. Along streams in the Cascade 

 Mountains from California to Brit. Coliimbia. 



6 BATRACHIUM S. F. Gray Brit. PL ii, 720. 

 Aquatic herbs with the submersed leaves if any finely dissected 

 into capillary divisions. Sepals 5, plain. Petals white with yel- 

 low base, and a naked nectariferous spot on the claw of each. A- 

 chenes transversely wrinkled on the sides. Peduncles solitary, 

 opposite the leaves. 



B. aquatile Du Mortier Bull. Bot. Soc. Belg. ii, 207. Ranuncvlus aqu- 

 atilis L, Glabrous : stems 6-20 inches long : floating leaves round-reniform, 

 5-9 lines in diameter, 3-5-lobed. the lobes coarsely crenate-toothed : pedun- 

 cles thicker than the petioles, 8-10 lines long, spreading or recurved in fruit : 

 sepals deciduous: flowers white, 5-10 lines in diameter: style subulate, 

 not longer than the ovary, introrsely stigmatic : receptacle hairy : achenes 

 reticulated, short-beaked. In ponds and shallow streams, California to 

 Alaska, Europe and Asia, 



B. trichophyllum Bosch Prodr. FL Bat. 5. Ranunculus aquatilis var. 

 trichophyllus Gray. Annual: stems coarsely filiform, 2-20 inches long: 

 leaves all submersed, round-reniform in outline, cut into numerous capillary 

 segments which are 4-10 lines long, short-petioled: peduncles 1-2 inches 

 long, longer than the petioles : flowers 3-5 lines in diameter : style subulate, 

 shorter than the ovary introrsely stigmatic : receptacle hairy ; achenes 

 several, in a close globular head, glabrous obliquely oblong. In ponds and 

 ditches : Oregon and Washington and across the continent. 



B. Loblm. Ranunculus Lobbii Gray. Glabrous annual: stems 6-12 inch- 

 es long : leaves commonly all floating, 3-9 lines wide, truncate or cordate 

 at base, deeply 3-lobed, middle lobe usually elliptical and entire, the later- 

 al ones usually oblong and with a broad notch in the apex ; submersed 

 leaves none or rudimentary: peduncles opposite the upper leaves, thicker 

 than the petioles 6-8 lines long : sepals a line long, persistent : petals 2 lines 

 long, obovate-oblong : stamens 5-9: style long and filiform, with a sm»ll 

 terminal stigma: receptacle glabrous: achenes 4-6, finely rugose, obovate, 

 about a line long, embraced by the persistent calyx. In pools that go 

 dry in summer, Oregon and California. 



7 RANUNCULUS Tourn. Inst. 285. L. Gen. n. 699. 



Herbs with alternate, entire or variously lobed leaves, and sol- 

 itary or scattered flowers. Sepals 5, plain, commonly colored 

 and reflexed. Petals 1-15, usually broad and conspicuous, with a 

 small pit or spot covered by a scale, on the claw inside. Achenes 

 usually numerous, in a globose to oblong head, usually flattened, 

 and beaked with the persistent style, not transversely rugose on 

 the sides. Ovule ascending. 



§ 1 Halodes Gray Proc. Am. Acad, xxi, 366. Mature carpels 

 thin-walled and utricular, compressed, striate with several simple 

 or sparingly branched nerves. Petals yellow with a nectariferous 

 scale near the base, deciduous with the sepals. 



