934 APOCYNACEAE 



Corolla funnelform, relatively large ; lobes inequilateral, longer than the 



tube. 2. Thevetia. 



Fruit a pair of follicles : herbs sometimes partially shrubby. 



Flower without a disk : leaves alternate. 3. Amsonia, 



Flower with a 2-lobed disk : leaves opposite. 



Anther with a foliaeeous connective : carpels 6-8-ovuled : stigma gla- 

 brous : corolla funnelform. 4. ViNCA. 

 Anther with an inconspicuous connective : carpels several-ovuled : 



stigma pubescent : corolla salverform. 5. Ammocallis. 



Anthers appendaged at the base, converging around the stigma and partially 

 adherent to it: corolla-lobes mostly dextrorsely convolute. 

 Shrubs or trees. 6. Nerium. 



Herbs or vines. 



Corolla appendaged within : calyx-tube partially attached to the gynoe- 



cium by the thick disk : upright herbs. 7. Apocynum. 



Corolla unappendaged : calyx-tube wholly free : vines. 

 Stigma appendaged with a reversed cup or .5 lobes. 

 Corolla funnelform, the throat widened upward. 



Calyx-lobes relatively long and narrow : scale-like glands borne 



at the base of the calyx within. 8. Urechites. 



Calyx-lobes relatively broad and short: scale-like glands wanting. 9. Rhabdadenia. 

 Corolla salverform, the throat narrowed upward. 10. Echites. 



Stigma merely thickened. 11. Trachelospermum. 



1. VALLESIA R. & P. 



Shrubs, with branching .stems. Leaves alternate, relatively few : blades entire. Flow- 

 ers in long-peduncled cymes becoming opposite the leaves. Calyx-lobes 5, relatively short. 

 Corolla salverform : tube swollen into a short neck which is constricted at the mouth : lobes 

 5, shorter than the tube, equilateral. Stamens adnate up to the throat of the corolla-tube : 

 anthers cordate, unappendaged. Disk wanting. Carpels 2. Stigma clavate. Drupe 

 mostly from 1 carpel, 1-2-seeded. Seeds clavate, naked. 



1. Vallesia glibra Cav. Shrub several m. tall, the bark pale. Leaves remote ; 

 blades elliptic to ol)long or oblong-lanceolate, 4-7 cm. long, acute or slightly acuminate, 

 fleshy-leathery, glabrous, sliort-petioled : cymes few-flowered : calyx-lobes triangular, less 

 than 1 mm. long : corolla white : tube 5-6 mm. long : lobes spreading, 3-4 mm. long ; 

 drupe narrow, 10-14 mm. long, rather dry. 



In thickets, Key West, Florida. Also in tropical .America and Chile. 



2. THEVETIA L. 



Shrubs or trees, with stout branches. Leaves alternate, numerous : blades narrow, 

 entire. Flowers solitary or few together. Calyx-lobes 5, relatively long. Corolla funnel- 

 form : tube dilated into a tiiroat not constricted at the mouth : lobes 5, longer than the tube, 

 inequilateral. Stamens adnate up to the bearded throat of the corolla : anthers unappen- 

 daged. Disk lobed. Carpels 2. Stigma 2-pointed. Drupe from 2 carpels, broad, 2-4- 

 seeded. Seeds rather triangular, naked. 



1. Thevetia Thevetia ( L. ) Millsp. Branching shrub. Leaves approximate ; blades 

 narrowly linear, 8-16 mm. long, lustrous above, slightly revolute, glabrous, sessile : calyx- 

 lobes lanceolate, 5-7 mm. long, acuminate : corolla saffron-colored ; tube 2-2.5 cm. long ; 

 lobes ascending, 3-4 cm. long : drupe depressed, 3-4 cm. broad. {_Thevetia neriifolia Juss.] 



In dry soil. Key West, Florida. Also in tropical America. 



3. AMSONIA Walt. 



Herbs. Leaves alternate : blades entire. Flowers in terminal thyrsoid or corymbose 

 cymes. Calyx-lobes 5, acuminate. Corolla mainly salverform : tube slightly dilated up- 

 ward, villous within : lobes narrow. Disk wanting. Stamens included : anthers unap- 

 pendaged. Carpels 2, connected by the slender styles. Stigma appendaged by a reflexed 

 membrane. Follicles 2 together, erect, several-seeded. Seeds unappendaged. 



A. Corolla or corolla-lobes pubescent without. 



Leaf-blades densely white-tomentose beneath : follicles pubescent. 1. A. Ludoviciana. 



Leaf-blades glabrous beneath or rarely with scattered hairs : follicles glabrous. 

 Leaf-blades relatively broad, oval to broadly oblong-lanceolate, not glaucous 



beneath at maturity, not callous-margined. 2. A. Amsonia. 



Leaf-blades relatively narrow, lanceolate to linear-lanceolate, glaucous be- 

 neath at maturity and callous-margined. 3. A. salicifoUa. 



B. Corolla glabrous without. 



Leaf-blades elliptic, glaucous beneath. 4. A. rigida. 



Leaf-blades oblong, linear or linear-filiform, green beneath. 



