APOCYNACEAE (DOGBANE FAMILY) 



2 LIMNANTHEMUM FLOATING HEART. (L. lacunbsum.) 



4 APOCYNACEAE. Dogbane Family. 



1 NfcRIUM OLEANDER. (N. oleander*) 



2 VfNCA. 



1 a Erect plant; flowers rose-colored to white 



MADAGASCAR PERIWINKLE. (V. rbsea*) 

 b Trailing plants ; flowers blue 2 



2 a Leaves ovate to oblong; calyx not hairy; plant usually 



in gardens and escaped MYRTLE. (V. minor.*) 



b Leaves ovate-heart-shaped; calyx hairy; plant culti- 

 vated in pots and boxes. .LARGE PERIWINKLE. (V. major.*) 



3 AP6CYNUM. 



i a Flowers pink, in loose cymes 



SPREADING DOGBANE. (A. androsaetnifblium.) 

 b Flowers greenish-white, in rather dense cymes 



INDIAN HEMP. (A. cannabtnum.) 



5 ASCLEPIDACEAE. Milkweed Family. 

 i ASCLEPIAS. 



1 a Leaves linear, % in. or less broad ; flowers whitish 



WHORLED MILKWEED. (A. vertidllata.) 

 b Leaves i in. or more broad 2 



2 a Leaves in whorls of 4, excepting the upper and lower 



ones .FOUR-LEAVED MILKWEED. (A. quadrifblia.) 



b All leaves opposite or alternate 3 



3 a Flowers orange BUTTERFLY- WEED. (A. tuberbsa.) 



b Flowers purplish, greenish, or whitish 4 



4 a Leaves heart-shaped and clasping at base, margins 



very wavy. BLUNT-LEAVED MILKWEED. (A. amplexicaulis.) 

 b Leaves not clasping at base, margins not wavy 5 



5 a Corolla greenish or purplish 6 



b Corolla bright red or purple 7 



6 a Horns shorter than the hoods; leaves rounded or taper- 



ing at base COMMON MILKWEED. (A. syrtaca.) 



b Horns longer than the hoods; leaves abruptly tapering 



at base POKE MILKWEED. (A. exaltata.) 



7 a Horns much shorter than the hoods; corolla deep purple 



PURPLE MILKWEED. (A. purpurdscens.) 

 b Horns longer than the hoods; corolla pink, red, or purple 8 



8 a Stem hairy; leaves ovate to oblong, hairy beneath 



HAIRY MILKWEED. (A. pulchra.) 

 b Stem not hairy; leaves lanceolate, usually not hairy 



beneath SWAMP MILKWEED. (A. incarnata.) 



2 ACERATES GREEN MILKWEED. (A. viridiflbra.) 



3 H6YA WAX PLANT. (H. carnbsa.*) 



4 STEPHAN6TIS MADAGASCAR JASMINE. (S. floribunda*) 



5 PERtPLOCA SILK VINE. (P. graeca*) 



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