936 APOCYNACEAE 



somewhat swollen near the top : lobes broad, spreading. Stamens included : anther 

 with an inconspicuous connective. Disk of 2 glands alternating with the carpels. Carpels 

 2, united by the styles. Stigma pubescent. Ovules several. Follicles 2 together, several- 

 seeded. Seeds unappendaged. 



1. Ammocallis rosea (L. ) Small. Stems 2-7 dm. tall, usually somewhat branched, 

 pubescent, woody, at least below : leaf-blades rather fleshy, oblong or slightly narrower 

 below the middle, 4-8 cm. long, rounded or retuseat the apex and mucronulate, pubescent, 

 short-petioled : calyx-lobes linear-subulate, 3-4 mm. long, pubescent: corolla-tube 2.5-3 

 cm. long, finely pubescent, with a protruding pit beliind each anther; limb white or pink 

 or white with a pink eye, the lobes 1.5-2.5 cm. long, oblique : follicles cylindric, 2-3 

 cm. long, pubescent. [ Vinca rosea L. ] 



In sandy soil, Florida. Also in the tropics generally. 



6. NERIUM L. 



Shrubs or trees, with stout branches. Leaves opposite, numerous : blades leathery, 

 entire. Flowers in terminal compound cymes. Calyx-lobes 5, narrow. Corolla rather 

 salverform : tube dilated into a narrowly campanulate throat : lobes spreading, about as 

 long as the throat. Stamens adnate to the corolla-tube : anthers appendaged at the base. 

 Carpels 2. Stigma surrounded by the anthers. Follicles narrow. Oleander. 



1. Nerium Olednder L. A shrub, or a tree becoming 10 m. tall, with smooth 

 branches. Leaf-blades narrowly elliptic or linear-elliptic, 6-15 cm. long, acute or acumi- 

 nate at both ends, conspicuously many-nerved : calyx-lobes lanceolate, 4.5-6 mm. long, 

 acuminate, puberulent : corolla showy, rose-purple ; limb 3-4.5 cm. broad, the lobes 

 obliquely apiculate : follicles erect or nearly so, 1-2 dm. long. 



In fields and on roadsides, Gulf States and adjacent territory. Naturalized from tlie Old World. 



7. APOCYNUM L. 



Herbs, Avith upright more or less branched stems. Leaves opposite : blades entire. 

 Flowers small, in corj'mbed cymes. Sepals 5, acute. Corolla white or pink, campanulate : 

 tube terete or angled, with 5 small appendages alternating with the stamens : lobes 5. 

 Stamens adnate to the base of the corolla-tube : antliers sagittate, converging about the 

 stigma and slightly adherent to it. Disk 5-lobed. Carpels 2, united only by the slender 

 styles. Stigma ovoid or sometimes 2-lobed. Ovules several in each carpel. Follicles 2 to- 

 gether, terete. Seeds numerous, each tipped with a long coma. Dogbane. Indian Hemp. 



Corolla pink. 5-7 mm. long: lobes revolute. 1. ^4. midrosaeinifolium: 



Corolla greenish white, :5-3.5 mm. long : lobes erect or nearly so. 2. .1. cannabinuin. 



1. Apocynum androsaemifolium L. Stems 3-15 dm. tall, like the widely-spread- 

 ing branches, mostly glabrous : leaf-blades ovate, oblong or oval, 4-11 cm. long, deep green 

 and glabrous above, pale and more or less pubescent beneath, short-petioled : cymes rather 

 lax : calyx-lobes ovate to ovate-lanceolate, 2-2.5 mm. long : corolla pink, 5-7 mm. long ; 

 lobes revolute : follicles 10-17 cm. long. 



In thickets and woodlands, Anticosti to British Columbia, Georgia and Texas. Summer. 



2. Apocynum canndbinum L. Stems 8-18 dm. tall, the branches erect or ascend- 

 ing, glabrous at maturity : leaf-blades oblong to ovate-oblong or oblong-lanceolate, 5-12 

 cm. long, glabrous, or slightly pubescent beneath, sliort-petioled : cymes rather dense : 

 calyx-lobes lanceolate, 2.5-3 mm. long: corolla greenish white, 3-3.5 mm. long; lobes 

 erect or nearly so : follicles 12-20 cm. long. 



In fields and thickets, Anticosti to British Columbia, Florida and Texas. Spring and summer. 



8. URECHITES Muell. Arg. 



Twining vines, with somewhat woody stems. Leaves opposite : blades flat, entire. 



Flowers in cymes terminating axillary or terminal peduncles. Calyx-lobes 5, relatively 



long and narrow. Corolla relatively large, funnelform, the tube abruptly dilated into a 



campanulate throat. Carpels 2. Follicles 2, spreading at maturity, usually very long. 



Leaf-blades glabrous : peduncles and pedicels glabrous or sparingly puberulent. 1. U. Andrewsii. 



Leaf-blades densely soft-pubescent beneath : peduncles and pedicels more or less pu- 

 bescent. 2. U. neriandra. 



1. Urechites Andrewsii (Chapm. ) Small. Stems 3-30 dm. long, reclining or twin- 

 ing, glabrous : leaf-blades leatiiery, oval to ovate or suborbicular, 2.5-5 cm. long, glabrous, 

 paler beneath than above, short-petioled : cymes 3-5-flowered : calyx-lobes lanceolate. 



