I^RiPLOCA. CII. ASCLEPIAD.- 



gtaminal corona 5-leaved, leaflets without hor^ 463 



the angles of the 



smooth or muricate. 



3ence of tJie horn-Ulx processes of tiie corona. L.vs. mob.^ \eaves. 



1. A. viRiDiFLORA. Ell. (and A. lanceolata. Ims, and \st. t-iabrmis 

 p,„-s/t.)_Suffruticose. at base, pubescent above; Us. elliptica ""-'^p^Q 



Gblong and lanceolate, briefly petiolate, scabrous above and on the i/; yiere 

 mentose-pubescent beneath; mnbds sessile, globose, many-flowered; ikl?-^^'^~^^^ 

 bescent ; 'pet. ovate, reflexed ; segments of the corona erect and adnata "jcom- 

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

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

 3 g or 8' long, \ — 3- 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. L,ons.-leavcil Aceraies. 

 Scabrous-puberulent ; &t. ascending, simple; lv&. alternate, numerous, 



linear and lance-linear, subsessiie, acute ; timbels half as long as the leaves, 

 numerous, many-flowered, pubescent, axillary, pedimculate; 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. Aioysiua 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 hy 2 

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

 pendulous ; stig. 5-angled, conical ; follicles eylindraceous, smooth. — ■ 

 %■ A twining herb, ivith opposite, cordate-ovate, acuminate Ivs. Fed. ra' 

 ccmose-umbcUate, many-flowered. Fls. white. 



E. ALBiDA. Nutt. 



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

 cent line. Leaves thin, glabrous, with roimded, auriculate lobes at base, 2 — ^3' 

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

 ochroleucous, sweet-scented. Jrdy, Aug. 



4. GONOLOBUS. 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. climbi7ig. Lvs. opposite, cor- 

 date. Fed. interpetiolar, racemed or corymbose. 



G. MACROPHYLLUs. (and G. hirsutus. MlcTix. Cynanchium obliquum. 

 Jacq. C. macrophyllus. MuU.)—St. tomentose-pubescent and with soft, 

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

 bescent • peel, shorter than the petioles, 2— 5-flowered, with linear bracts at sum- 

 mit ■ pp\ linear or linear-oblong, obtuse, smooth above, minutely puberulent 

 beneath.— Thickets, along streams, Penn. to Car., V/. 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—7" by 1". June, July. 



5. PERIPLOCA. 

 Gr. vepi, aroimJ, n-XtjJi*;, a bimling ov twining; from the habit of (lie plant. 



Calyx minute ; corolla rotate, flat, 5-parted, orifice surrounded by 



