Apocynaceae

Flytrap Dogbane: Apocynum androsaemifolium (Synonyms: Apocynum ambigens, Apocynum androsaemifolium ssp. androsaemifolium, Apocynum androsaemifolium ssp. pumilum, Apocnum androsaemifolium var. pumilum, Apocynum androsaemifolium var. incanum, Apocynum androsaemifolium var. tomentellum, Apocynum pumilum, Apocynum pumilum var. pumilum, Apocynum pumilum var. rhomboideum) - Flowers pink and 5-7 mm long. Plants 20-50 cm high. Calyx less than half as long as the corolla. Leaves petiolate and spreading or drooping.

Common Dogbane, Hemp Dogbane, Indian-hemp: Apocynum cannabinum (Synonyms: Apocynum cannabinum var. glaberrimum, Apocynum cannabinum var. suksdorfii, Apocynum sibiricum) - Flowers white to greenish-white and 2-4 mm long. Plants 30-100 cm high. Leaves short petiolate above, often subsessile below.

Western Dogbane: Apocynum X floribundum (Synonyms: Apocynum medium, Apocynum medium var. floribundum, Apocynum medium var. lividum, Apocynum medium var. medium, Apocynum medium var. vestitum) - Flowers pink and 4.5-6 mm long. Calyx at least half as long as the corolla. Plants 20-60 cm high. Leaves subsessile to petiolate and often ascending.

Indian Hemp, Clasping-leaved Dogbane: Apocynum sibiricum - Flowers white to greenish-white and slightly larger than in A. cannabinum. Plants 30-100 cm high. Leaves subsessile to sessile, often with clasping, cordate bases.

Periwinkle, Greater Periwinkle, Bigleaf Periwinkle, Vinca: Vinca major - Flowers large (3-5 cm wide) and blue. Plants are viny and serve as a domestic groundcover.

Common Periwinkle, Lesser Periwinkle: Vinca minor -