mm. long, smooth, usually finely pubescent, the margin inconspicuous but winged 

 along the short stalk at the base, the slender or flattened beak a little winged 

 and 0.6 mm. long (not recurved); receptacle globose, 2-3 mm. long in flower, 

 8-17 mm. long in fruit, glabrous. 



In wet mt. meadows, old lake beds, in wettish soils about lakes but also in 

 dry situations in N. M. (Rio Arriba Co.) and Ariz. (Coconino Co.), June-Sept.; 

 S.D. to B.C., s. to N.M., Ariz, and Calif. 



Our material is usually referred to var. ellipticus Greene, with basal leaves 

 usually entire and elliptic to oblanceolate and cauline leaves entire to 3-lobed. 



20. Ranunculus flammula L. Fig. 460. 



Nearly glabrous perennial; roots filiform; stems reclining, often stoloniferous, 

 rooting at the lower nodes, 1-5 dm. long, simple or branching above and 2- to 

 25-flowered, glabrous or with a few stout appressed hairs; leaves alternate, often 

 in fascicles at rooting nodes; petioles 2-7 or 13 cm. long or the leaves sessile, 

 the stipular leaf bases mostly 1-2.5 cm. long; blades simple, linear-filiform to 

 oblanceolate or lanceolate to obovate, 2-6 (-8) cm. long, to 13 mm. broad, entire 

 or serrulate, acute at both ends or apically truncate and glandular, glabrous or 

 somewhat appressed-hairy; pedicels 2-10 cm. long, appressed-hairy; sepals 5, 

 yellowish-greeji, 1.8-5 mm. long, about 1.5-2.5 mm. broad, appressed-hairy 

 dorsally or glabrous, promptly deciduous; petals 5 or rarely up to 11, yellow, 

 obovate to cuneate-obovate, 2-8 mm. long, 1.3-7 mm. broad; nectary scales 

 glabrous, forming a tiny pocket, usually truncate; stamens 25 to 50; achenes 

 5 to 50 in a globose or hemispheroidal head 1.5-5 mm. long and 2-5 mm. in 

 diameter, obovate, 1.3-1.7 mm. long, smooth or finely reticulate, glabrous, the 

 margin clearly marked but not prominent; beak stout or in some varieties slender, 

 0.1-0.5 or 0.7 mm. long, straight, usually stigmatic largely across the truncate 

 apex; receptacle obovoid, 1 mm. long in flower, 0.6-3 mm. long in fruit, glabrous. 

 Incl. var. ovalis (Bigel.) L. Benson. 



In mud and water at edge of lakes, ponds and streams, in wet meadows, 

 marshes, ditches and swamps, often brackish, in N.M. (San Juan and Socorro 

 COS.) and Ariz. (Apache, Navajo and Coconino cos.), June-Sept.; Nfld. and N.S. 

 to Alas., s. to Pa., N.J., N.M., Ariz, and Calif. 



21. Ranunculus hydrocharoides Gray. Fig. 461. 



Glabrous or slightly appressed-pubescent perennial; roots filiform or slender; 

 stems procumbent or floating or some of the flowering ones suberect, rooting at 

 the lower or all the nodes, 1-2.5 dm. long, 1- to 3-flowered, often fistulous in 

 the aquatic forms; petioles 2-8 cm. long; basal leaf blades simple, cordate, elliptic 

 or ovate to lanceolate. 5-28 mm. wide, entire or dentate to serrate, proximally 

 truncate, subcordate or angled and distally acute or somewhat rounded; cauline 

 leaves alternate, like the basal but tending to be ovate-lanceolate or lanceolate, 

 petioled; pedicels mostly 1-6 cm. long in flower, 3-8 cm. long and curved in 

 fruit, glabrous or sparsely pubescent; sepals 5, greenish-yellow, spreading, ovate, 

 2-3 mm. long, 1.5-2 mm. wide, early deciduous; petals 5 to 8 or 13, light-yellow, 

 2-6 mm. long, 1-3 mm. wide; nectary scale forming a pocket or at least a 

 shallow one, glabrous; stamens 10 to 40; achenes 10 to 25 in a hemispheroidal 

 or subglobose head 2-3 mm. in diameter, obovoid, 1-4 mm. long, smooth, glab- 

 rous, the margin inconspicuous; beak produced from the ventral side of the apex 

 of the body, slender, 0.8-1 mm. long, straight; stigma long-attenuate; receptacle 

 pyriform-globose, 1 mm. long in flower, 1-2 mm. long in fruit, glabrous, Incl. 

 var. stolonifer (Hemsl.) L. Benson. 



In mud and water of springs, ponds, lakes and streams, in wet meadows, 

 swamps and marshes, in N. M. (Catron, Grant and Socorro cos.) and Ariz. 



946 



