290 APOCYNACEAE. 



5-12 cm. broad, sometimes notched at the apex; scapes 30-60 cm. high; 

 flowers white, in a cyme; corolla lobes not bearded but with a median crest. 

 In bogs, Alaska to British Columbia and Granville, Washington, where it 

 was collected by Canard. 



Family 81. APOCYNACEAE. DOGBANE FAMILY. 

 Herbs (in ours) with acrid milky juice; leaves entire, opposite, 

 without stipules; flowers regular; calyx free from the ovaries; 

 corolla gamopetalous, 5-lobed; stamens 5, alternate with the 

 corolla-lobes, epipetalous; pistils of two carpels, the ovaries 

 separate (in ours), the styles or stigmas united; fruit a pair of 

 follicles; seeds many, often downy-tufted at the apex; endosperm 

 not copious. 



402. APOCYNUM. DOGBANE. 



Perennial herbs; leaves opposite, mucronate-pointed; flowers 

 small, in cymes, on short pedicels; calyx 5-parted, the lobes acute; 

 corolla bell-shaped, 5-cleft, bearing 5 triangular appendages 

 below the throat, opposite the lobes; stamens 5, on the very base 

 of the corolla; fruit of two long and slender follicles; seed with a 

 tuft of long silky down at the apex. 



Corolla lobes erect; leaves oval or oblong. A. cannabinum. 



Corolla lobes spreading or recurved; leaves ovate. A. androsaemifolium. 



Apocynum cannabinum L. Glabrous throughout or sometimes puberulent, 

 pale green; stems erect, branched above, 60-100 cm. high; leaves oblong- 

 elliptic or somewhat lanceolate, cuspidate-acuminate, rounded or cuneate at 

 base, the margin slightly revolute, 2-6 cm. long; petioles 5-8 mm. long; calyx- 

 lobes lanceolate-acuminate, 2-3 times as long as the tube; corolla white, 3-5 

 mm. long, the lobes erect; pods reflexed, linear, tapering at each end, 6-8 cm. 

 long. 



The common form in our region with corolla 3 mm. long and flowers in a 

 small terminal cyme surrounded by leafy branches has been considered a 

 distinct species, A. suksdorfii Greene. 



Apocynum androsaemifolium L. Stems 30-90 cm. high; branches erect 

 or ascending, glabrous throughout or rarely puberulent, usually very flori- 

 ferous; leaves ovate, cuspidate, 1-4 cm. long, dark-green above, pale beneath, 

 short-petioled; flowers rose-colored; calyx-lobes about equalling the tube; 

 corolla 5-6 mm. long, the lobes recurved; pod 6-8 cm. long, spreading or 

 reflexed. 



In dry open woods. 



Family 82. CONVOLVULACEAE. MORNING GLORY FAMILY. 

 Mostly twining or trailing herbs, often with milky juice; 

 leaves alternate; flowers regular, perfect, mostly showy; calyx 

 5-lobed; corolla gamopetalous, 5-plaited or lobed, convolute or 

 twisted in the bud; ovary 2-celled; ovules 2 in each cell, the cells 



