POLYANDRIA POLYGYNIA. 370 



251. CLEMATIS. Invol. Q, or calyciform; calyx 4 8-leaved, color 

 ed ; pet. 0, or very short ; seeds with a long, mostly plumose cauda. 



252. ANEMONE. InvoL 3-leaved, distant from the flower; leaflets di- 

 vided; calyx petaloid, 5 15-leaved; pet. 0; seeds numerous. 



253. THALICTRTJM. Invol. 0; calyx 4 5-leaved, petaloid ; pet. 0; 

 seeds without awns. 



254. CALTHA. Calyx colored, 5-leaved; leaflets orbicular, petaloid ; 

 caps. 5 10, compressed, spreading, 1-celled, many-seeded. 



255. COPTIS. Calyx 5 6-leaved, colored, and petaloid, deciduous; 

 pet. small, cucullate ; caps. 5 8, stipulate, diverging, ovate-oblong, 

 5 6-seeded, rostrate. 



256. HEPATIC A. Invol. 3-leaved, near the flower, resembling a ca- 

 lyx ; leaflets entire ; calyx 6 9-leaved, petaloid, disposed in several 

 series ; seeds without awns. 



257. RANUNCULUS. Calyx- 5-leaved; pet 5, with a nectariferous 

 pore at the base, on the inside; capsules numerous, ovate, shortly 

 mucronate, 1 -seeded, not opening. 



258. BRASENIA. Calyx 3-leaved; pet. 31; pericarp oblong, 2- 

 seeded ; seeds pendulous. 



POLYANDRIA. 

 POLYGYNIA. 



Specie*. 238. TILIA. Bass-wood. 



T. glabra: leaves round-cordate, abruptly acuminate, acutely serrate, 

 subcoriaceous, smooth ; petals truncate at the apex, crenate ; style as 

 long as the petals, equal ; fruit ovate, subcordate. 



HAB. Woods. June. A large tree; flower cymose; yell.-white, 

 ped. winged. 



239. HELIANTHEMUM. 



H. canadense: without stipules; erect, hairy; leaves erect, linear- 

 lanceolate, flat, paler beneath ; raceme terminal, few-flowered ; seg- 

 ments of the calyx broad-ovate ; capsule shorter than the calyx. 



HAB. Dry fields and woods. June, % ; a foot high ; Jlower yel- 

 low ; calyx hairy. 



240. PORTULACCA. Purslane. 



P. oleracea : leaves cuneiform, smooth ; flowers sessile. 

 HAB. Cultivated grounds, &c. May Aug. <v) ; spreading, succr* 

 lent ; Jlower yellow. . 



