KEY. 181 



414. Filaments monadelphous. Pollen-masses 10, fixed 

 to the sligraa in pairs 415 



Filaments distinct, or nearly so. Pollen-masses 5, 

 granular, separately attached to the stigma. Corolla wheel- 

 shaj^ed, with 5-awned scales in the throat. Anthers beard- 

 ed on the back. Twining, shrubby plants. Leaves ovate, 

 or ovate-lanceolate. Flowers brownish-purple, in ]3anicled 

 cymes. Corolla-lobes linear-oblong, A-ery hairy above. 



Periploca Graeca, L. 



41o. Pollen-masses pendulous and vertical 416 



Pollen-masses horizontal. Corolla wheel-shaped, 

 sometimes reflexed-spreading. Crown a wavy-lobed, fleshy 

 ring. Anthers horizontal, partly hidden under the flat 

 stigma. Pods ribbed, or with soft prickles. Twining, herba- 

 ceous, or shrubby plants. Leaves heart-shaped, usually 

 hairy. Flowers dark purjjle, in extra-axillary umbels. 



Gonolobus. 



416. Calyx- and corolla-lobes reflexed, or spreading. 

 Crown of 5 hooded-fleshy bodies. Flowers in simple, many- 

 flowered umbels. Corolla greenish, white, yellowish, pur- 

 ple, or pink 417 



Calyx and corolla erect. Crown of 5 membrana- 

 ceous bodies, each terminated by a 2-cleft tail. A twining 

 herb. Leaves ovate-cordate, long-petioled. Flowers small, 

 whitish, in racemose-umbellate clusters on axillary pedun- 

 cles. Enslenia albida, Nutt. 



417. Hooded bodies with an incurved horn in the 

 cavity of each, from its base curved toward the stigma. 

 Pods ventricose, sometimes with warty or spinous projec- 

 tions, one of the 2 often abortive. Herbs upright. Leaves 

 rarely scattered. Umbels on terminal, or mostly lateral pe- 

 duncles. Asclepias. 



Hooded bodies without a horn. Leaves obovate, 

 lanceolate, or linear. L^mbels ped uncled or nearly sessile. 



Acerates. 



41 8. (322.) Leaves twice-pinnate. Ovary 1-celled. 

 Calyx 5-toothed, minute. Stamens 10-12, distinct or slight- 

 ly united at the base. Pod long, narrow, prickly. Flowers 

 rose-color, small, in axillary, peduncled, rounded heads. 

 Herbs, with the procumbent stems and petioles prickly. 



Schrajikia. 



