Order 97.— ASCLEPIADACEiE. 595 



concave, split on the inner side, apex reflexed ; pollinia suspended by 

 the attenuated apex, compressed ; stigma depressed, 5-angled ; follicle* 

 2, long, slender, smooth. — 2f St. low, simple. Lvs. opposite. Umbela 

 extra-axillary, few-flowered. 



P. pubescens Ell. In wet or moist grounds, S. Car., Ga., Fh. (Macon, Prof. 

 Loomis), Tallahasseo (Mettauer) and Apalachicola ! Plant of singular appearance, 

 8 to 14' high, slender, pubescent. Lvs. linear-oblong, rarely linear-ovate, ob- 

 tusish, sessile, erect, 1 to 18" long. Umbels 3 to 5, alternate, 3 to 5-rlowered, 

 rather shorter than the leaves. Fls. cylindric bell-shaped, yellowish green, 4" 

 long, erect, the crown conspicuously pediceled. May, Jn. 



6. SENTE V RA, Reich. Calyx of 5 lanceolate, acute sepals ; corolla 

 subrotatc, 5-parted, acute, glabrous ; crown segtn. 5, erect, flattish, ro- 

 tuse, ad n ate to the base of the sessile anthers; pollinia ovoid, fixed by 

 the apex, pendulous ; stigma bifid ; follicles 2, smooth ; seeds comous. 

 — % Slender, twining, with linear, fleshy lvs., few-flowered umbels, 

 (Lyonia, Ell. ncc Nutt.) 



S. raaritima Decn. In salt marshes, S. Car. to Fla., twining around tho rushes, 

 &e. "Wholo plant very smooth. Lvs. opposite, sessile, channeled, 1' long. Um- 

 bels between tho leaves, 7 to 10-flowered. Sep. ciliolate, erect. Petals acute, 

 greenish, twico longer than th3 whito crown. Follicles very slender. Jn. — Oct. 

 (S. maritima Ell.) 



7. ENSLE'NIA, Nutt. (In memory of Mr. Aloysius Unslen, 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. — 21 A twining herb, with opposite, £or- 

 datc-ovate, acuminate lvs. Pcd. racemous-umbellate, many-flowered. 

 Fls. white. 



E. albida Nutt. — TV. and S. States, common. Sts. slender, with an alternate, 

 pubescent lino. Lvs. thin, glabrous, with rounded, auriculatc lobes at base, 2 to 

 3' long and wide, ending in a slender point, margins entire. Pcd. axillary, as 

 long as tho petioles. Fls. ochrolencous, sweet-scented, 2" long. Jl, Aug. 



8. GOKOL'OBUS, Mx. (Gr. y&vog, angle, Ao/3oc, pod ; the fruit of 

 some species is angular.) Calyx 5-parted, spreading; corolla subro- 

 tatc, 5-parted, convolute in bud ; crown a small, fleshy, undulate-lobed 

 ring, a'.tached to the throat of the corolla ; anthers opening transversely 

 beneath the stigma ; pollinia 5 pairs, horizontal ; follicles turgid, seeds 

 comous. — 21 More or less shrubby, twining or prostrate. Lvs. cordate, 

 hairy, opposite. Umbels extra-axillary. 



1 G. macrophyllus Mx. St tomentous-pubescent and with soft, scattered 

 hairs; lvs. broad, ovate or oval, cordate, acuminate, pubescent beneath, at length 

 glabrous above ; pcd. shorter than the petioles, 2 to 5-fiowered, with linear bracts 

 at summit; petals linear or linear -ollojig obtuse, (6" long), smooth above, min- 

 utely puberulent beneath ; follicles costate-angled. — Thickets along streams. Penn. 

 to Ky. and Ga. Vine trailing or climbing 3 to 5f. Lvs. thin, 3 to 6' by 2 to 4', 

 tho lobes at base rounded and often nearly or quite closed, with a short acumina- 

 tum at apex. Fls. dark purple. Petals 5 to 7" by l". Jn., Jl. (G. dis- 

 color, B. M.) 



ji. Levis. Plant nearly smooth, ccr. eogm. smooth both sides. — South. (G. 

 bvia Mx.) 

 2 G. Inrsutus Mx. St. hirsute-pubescent ; lvs. broad-ovate, acuminate, cordate, 

 minutely pubescent both sides ; ped. shorter than the 2^tioles, fcw-tlowered, witft 



