PERIPLOCA. GIL ASCLEPIADACE^. 461 



staminal corona 5-leaved, leaflets without horns, concave, appressed to 

 the angles of the antheridium ; pollinia 5 pairs, pendulous ; follicles 

 smooth or muricate. % Herbs differing from Asctepias only in the ab- 

 sence of the horn-like processes of the corona. Lvs. mostly opposite. 



1. A. VIRIDIFLORA. Ell. (and A. lanceolata. Ives, and 1st. edit. Asclepias. 

 Pursh.) Suffruticose at oase, pubescent above; Ivs. elliptical, varying to 



oblong and lanceolate, briefly petiolate, scabrous above and on the margin, to- 

 mentose-pubescent beneath; umbels sessile, globose, many-flowered ; pedicels pu- 

 bescent ; pet. ovate, reflexed ; segments of the corona erect and adnate to the 

 antheridium. Can., Conn, to Ark., in dry, stony soils. Stem 2 3f high, as- 

 cending and often branched at base, clothed with dense, close hairs. Leaves 

 3 6 or 8' long, \ as wide, obtuse or acute, or even acuminate, scarce- 

 ly petiolate. Flowers green, small, inelegant, in 2 or 3 small, subglobose um- 

 bels. July. The plant varies greatly in respect to its leaves. 



2. A. LONGIFOLIA. Ell. Long-leaied Acerates. 

 Scabroue-puberulent ; st. ascending, simple ; Ivs. alternate, numerous, 



linear and lance-linear, subsessile, acute ; umbels half as long as the leaves, 

 numerous, many-flowered, pubescent, axillary, pedunculate ; corona scales 

 shorter than the antheridium. Mich, to la. ! and Miss., in meadows and prai- 

 ries. Stem stout, 2 3f high. Leaves 3 5' (including the 1 3" petiole) by 

 3 5". Flowers very numerous in each umbel, green, peduncle and pedicels 

 about 1' long. July, Aug. 



3. ENSLENIA. Nutt. 

 In memory of Mr. Aloysius Enslen, who collected many plants in the Southern States. 



Calyx small, 5-parted ; cor. 5-parted. segments erect ; corona 5- 

 leaved, leaflets membranaceous, free, truncate, each terminated by 2 

 filiform, flexuous lobes ; pollinia oblong, obtuse at base and apex, 

 pendulous ; stig. 5-angled, conical ; follicles cylindraceous, smooth. 

 '2J- A twining herb, with opposite, cordate-ovate, acuminate Ivs. Ped. ra- 

 cemose-umbellate, many-floicered. Fls. white. 



E. ALB1DA. Nutt. 



Ohio, Clarke ! to Va. and Ark. Stems slender, with an alternate, pubes- 

 cent line. Leaves thin, glabrous, with rounded, auriculate lobes at base, 2 3' 

 diam., margin entire. Peduncles axillary, as long as the petioles. Flowers 

 ochroleucous, sweet-scented. July, Aug. 



4. GONOL6BUS. Michx. 



Calyx much smaller than the corolla ; cor. rotate, deeply 5-parted ; 

 corona small, shield-form, undulate, 5-lobed ; antheridium depressed, 

 discoid, pentangular, terminated by a membrane ; pollinia transverse, 

 5-pairs ; follicles 2 ; seeds comose. % St. climbing. Lvs. opposite, cor- 

 date. Ped. inter petiolar, racemed or corymbose. 



G. MACROPHYLLUS. (and G. hirsutus. Michx. Cynanchium obliquum. 



Jacq. C. macrophyllus. MM.} St. tomentose-pubescent and with soft, 

 scattered hairs ; Ivs. broad, ovate or oval, cordate, acuminate, tomentose-pu- 

 bescent ; ped. shorter than the petioles, 2 5-flowered, with linear bracts at sum- 

 mit ; pet. linear or linear-oblong, obtuse, smooth above, minutely puberulent 

 beneath. Thickets, along streams, Penn. to Car., W. to Ohio ! Ky. Vine 

 trailing or climbing, 3 5f. Leaves 3 5' by 2 4', the lobes at base rounded, 

 and often nearly or quite closed, with a short acumination at apex. Flowers 

 dark purple. Petals 5 1" by I". June, July. 



5. PERIPLOCA. 



Gr. irept, around, irAcJK>7, a binding or twining ; from the habit of the plant. 



Calyx minute ; corolla rotate, flat, ^-parted, orifice surrounded by 



