138 Flora of the Palouse Region 



S-10 mm. long: corolla blue-purple, longer than the calyx; glands round, a 

 single one near the base of each lobe: styles very short: capsules ovate, much 

 flattened; seeds flat, thin-margined, minutely pitted. Common in open 

 woods, Kamiack Butte and Thatuna Hills. 



Family 60. APOCYNACEAE. 



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

 without stipules: flowers regular: calyx free from the ovaries: cor- 

 olla gamopetalous, 5-lobed: stamens 5, alternate with the corolla- 

 lobes, epipetalous: pistils of two carpels, the ovaries separate, the 

 styles or stigmas united: fruit a pair of follicles; seeds many, often 

 downy-tufted at the apices; endosperm not copious. 



230. APOCYNUM. 



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 tw r o long and slender follicles: seed with a tuft of 

 long silky down at the apex. 



Corolla-tube not longer than the calyx, with erect lobes. A. CANNABINUM. 

 Corolla-tube longer than the calyx, with revolute lobes. A. pumilum. 



A. 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. At least three forms or possibly closely allied species are in- 

 cluded in the above description: one from near Wawawai, glabrous, with 

 flowers 3 mm. long, in small cymes: a second from Guy, glabrous, with loose 

 cymes and flowers 5 mm. long: a third from Wawawai, puberulent through- 

 out, very floriferous, the corollas 4 mm. long, with ciliate lobes. 



A. pumilum Greene. Much branched from the base, 30-40 cm. high: 

 branches erect or ascending, glabrous throughout or rarely puberulent, usu- 

 ally very floriferous: leaves ovate or oblong, 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 reflexed: pod 6-8 

 cm. long, spreading or reflexed. Common on hills, difficult to eradicate 

 and sometimes a troublesome weed. A puberulent prostrate form which 

 may be distinct occurs in open pine woods in the Thatuna Hills. 



Family. 61. ASCLFPIADACEAE. 



Herbs with milky juice: leaves entire, opposite, whorled or rarely 

 alternate, without stipules: flowers regular, 5-merous, usually in 

 simple umbels; corolla gamopetalous, 5-lobed; stamens attached 



