APOCYNACEAE. 227 



tended by a narrow bract. Calyx-lobes 4, keeled, narrowed upward. Corolla 

 white or yellowish, rotate : lobes 4, longer than the tube. — Sum. and fall. 



Corolla-lobes oblong, more or less erose, abruptly pointed : branches and pedicels 

 stiff. 1. B. virginica. 



Corolla-lobes lanceolate, entire, acute or acuminate : branches 



and pedicels lax. 2. B. lanccolata. 



1. B. virginica (L.) B.S.P. Plant 1-4 dm. tall: leaves (scales) opposite, or 

 alternate on small plants: calyx-lobes subulate or lanceolate-subulate: corolla 

 yellowish-white ; lobes mostly 2-2.5 mm. long : capsules 3-5 mm. long. — S. 

 Rare, on grassy banks. — Schists, 



2. B. lanceolata Small. Plants 2-6 dm. tall: leaves (scales) opposite or alter- 

 nate: calyx-lobes similar to those of B. virginica: corolla greenish- white ; 

 lobes mostly 2.5-3 mm. long : capsules 4-5 mm. long. — S. Eather rare, in 

 swamps. — • Schists. 



Pamily 2. MENYANTHACEAE. Buckbean Family. 



Perennial aquatic or bog herbs. Leaves alternate : blades simple or 

 3-foliolate. Flowers perfect, solitary, or in clusters or racemes. Calyx of 

 5 partly united sepals. Corolla wliite or colored, rotate, or funnelform. 

 Androeeium of 5 stamens, with the filaments partly adnate to the corolla- 

 tube. Gynoecium of 2 united carpels. Style very short. Fruit a capsule, 

 sometimes indehiscent. 



1. MENYANTHES [Tourn.] L. Bog herbs with stout rootstocks. Leaves 

 erect: blades 3-foliolate. Eaceme or panicle erect. Calyx persistent: lobes 5. 

 Corolla funnelform, deciduous: lobes as long as the tube or longer, bearded 

 within. Filaments slender. Anthers curved. Capsule erect, short, opening 

 irregularly. 



1. M. trifoliata L. Eootstock sheathed: leaflets 3-11 cm. long; blades oblong 

 to obovate, sessile: scape 1-3 dm. tall: bracts fleshy: calyx-lobes ovate-lanceo- 

 late to lanceolate, 4-5 mm. long: corolla white or reddish, 8-11 mm. long: 

 capsules subglobose, 6-7.5 mm. in diameter, apiculate. — M. Eare and local, 

 in Dillerville swamp and along the Conestoga Creek above Lancaster. — Lime- 

 stones. — Spr. and sum. — Buckbean. 



Order ASCLEPIADALES. 



Herbs, shrubs, or trees, commonly with a milky juice. Leaves alternate 

 or opposite : blades entire. Inflorescence eymose, sometimes umbellate. 

 Calyx of usually 5 partially united sepals. Corolla of 5 partially united 

 petals. Androeeium of mostly 5 distinct or motiadelphous stamens, par- 

 tially adnate to the corolla in Asclepiadaceae and accompanied by a 5- 

 lobed crown. Pollen granular or in waxy masses. Gynoecium of usi;ally 

 2 carpels sometimes united only at the apex. Stigma terminal. Fruit a 

 pair of follicles, or drupaceous. 



Styles united : stamens distinct : pollen loosely granular. Fam. 1. Apocynaceae. 

 Styles distinct : stamens monadelphous : pollen united 



into waxy masses. Fam. 2. Asclepiadaceae. 



Family 1. APOCYNACEAE. Dogbane Family. 



Perennial herbaceous or Avoody plants, with mostly diehotomous 

 eymose inflorescence. Androeeium of mostly 5 stamens, with the anthers 



