A8CLEPIADB.B. (MILKWEED FAMILY.) 523 



an acute, membranous tip. Nectary consisting of 5 glands. Style 

 nearly ; stigma ovoid, dilated, somewhat 2-lobed at apex. Follicles 

 2, slender, elongated. Seeds long-hairy — Herbs, with shrubby base, 

 milky juice, and opposite leaves. 



A. Vcnetum, L. 11.5 to 1, paniculate. Leaves glabrous, ovate 

 to elliptical and oblong, mucronulate, with cartilaginous margins. 

 Cymes terminal, compound; calyx canescent, with acute, triangular 

 lobes; corolla-lobes as long as tube — Summer — Swamps, and es- 

 pecially salt marshes ; Marash, and westward and eastward. 



Order LXVII. ASCLEPIADE^, R. Br. (Milkweed Family). 



Herbs or shrubs, generally with mUky jidce, and op- 

 posite, entire leaves or 0, a ^-parted, persistent calyx, a mo- 

 nopetalous, regular, hypogynous corolla, 5 stamens inserted 

 071 base of corolla, filaments (except in Periploca) connate 

 in a tube (gynostegiura), inchcding the pistil, anthers attach- 

 ed to the stigmas by means of connate spurs, styles 2, con- 

 nate at apex, stigma 1, pentagonal, having brown glands at 

 angles alternating with anthers. Pollen-masses as many as 

 anther-cells, adherent to the stigmatic glands; follicles 2, 

 seeds usually hairy — Anthers 2- or incoinpletelj 4-celled. 

 Crown at throat of corolla entire, lobed, or composed of se- 

 parate scales, or 0. 



* Filaments free or united below. Pollen-masses granular, separately applied to stigrnatic glands. 



1. PEEIPLOCA. Shrubs, vvitli brownish-green or yellow flowers. 



** Filaments connate. Pollen-masses waxy, fixed to the stigma in pairs by a gland, luinging 



vertically. 



t Anthers ending in a hyaline or opaque membrane, projecting above disk. 



X Pollen-masses pendulotis, beneath the margin of the stigma. 



$ Crown of scales not adherent to gynostegium. 



2. GLOSSONEMA. If Herbs; leaves ovate-oblong to linear; clusters axillary; flowers minute. 



3. SOLENOSTOMA. ^ Stifl'-branched; leaves ovate-oblong; umbels axillary; flowers white. 



4. OXYSTELMA. If Climbing herbs, leaves linear; racemes axillary; flowers pink. 



$ $ Crown of scales adnate to gynostegium or dorsum of anthers. 



5. GOMPHOCAEPUS. ^ Low shrubs ; leaves oblong- to linear-lanceolate. Flowers not 



inflated 



6. CALOTEOPIS. ^ Small trees; leaves large, obovate; follicles obovate, inflated, 



$ $ $ Crown entire or lobed, adnate to gynostegium. 

 IT Longer lobes of outer or single crown opposite anthers. 



7. VINCETOXICUM. 2f T-ow, perennial herbs, with ovate leaves. 



8. CTNANCHTTM. 2|! Twining, herbaceous perennials, with cordate leaves. 



9. PENTATEOPIS. 2f Twining perennials, with oblong to elliptical leaves. 



IT IT Longer lobes af outer or single crown alternate with anthers. 



10. DiEMIA. ^ Twining, climbing; leares cordate or reniforra. 



X X Pollen-masses at the level of the margin of the stigma or above it. 



