DOGBANE FAMILY 369 



glabrous 1.5-2 mm. long; corolla 2-3 mm. long and nearly as broad, the lobes erect; follicles 

 pendulous, slightly falcate, 8-15 cm. long, slender; seeds 4-5 mm. long, their coma 2-3 cm. long. 



Usually in partial shade or moist places, Upper Sonoran and Transition Zones; \Vashington to southern 

 California, east to Quebec, Pennsylvania, and Florida. Type locality: "Canada, Virginia. June-bept. 



Apocynum cannabinum var. pubescens (Mitchell) A. DC. Prod. 8:440. 1844 (Apocynum pubescens 

 Mitchell ex K Br Mem. Wern. Soc. 1: 63. 1809.) General habit of the preceding, but the inflorescence and 

 both surfaces of the leaves pubescent or somewhat tomentose. The variety has about the same wide range as the 

 typical species, but is much less common in the Pacific States, where it has been collected on the edges of sloughs 

 and marshes in Butte, Humboldt, and Solano Counties, California. Type locality: Virginia. 



2. Apocynum sibiricum var. salignum (Greene) Fernald. Clasping-leaved 



Dogbane. Fig. 3827. 



Apocynum salignum Greene, Tittonia, S: 64. 1902. 



Apocynum ncvadcnse Goodding, Bot. Gaz. 37: 57. 1904. 



Apocynum dcnsifiorum, A. Brcwcri, A. thermale, A. longifolium Greene, Leaflets Bot. Obs. 2: 176-177. 1912. 



Apocynum hypcricifolium var. salignum Beg. & Bel. Atti R. Accad. Lincei V. 9: 118. 1913. 



Apocynum sibiricum var. salignum Fernald, Rhodora 37: 328. 1935. 



Stems erect or slightly decumbent at base, 2-6 dm. high, branches opposite or nearly so, 

 herbage glabrous throughout. Leaves nearly or quite sessile and the lower often amplexicaul, 

 4-10 cm. long, oblong to oblong-lanceolate, acute or obtuse at apex, obtuse, subcordate or rarely 

 acute at base, pale green beneath and often nearly as pale above, usually mucronate at apex, 

 cymes terminal, the bracts subulate, herbaceous; calyx-lobes 1.5-2 mm. long; corolla short- 

 cylindric, longer than broad, 3 mm. long, the lobes erect; follicles 6-15 cm. long; seeds 3.5^ 

 mxn. long, the coma 15-20 mm. long. 



Usually in moist places. Upper Sonoran and Transition Zones; British Columbia, eastern Washington and 

 Oregon, to southern California, east to Manitoba, Minnesota, and Texas. Type locality: Humboldt County, 

 California. June-Aug. 



Apocynum Suksdorfii Greene, Pittonia 5:65. 1902. (Apocynum oliganthum Greene, Leaflets Bot. Obs. 

 1: 58. 1904- A. cannabinum var. oliganthum Beg. & Bel. Atti R. Accad. Lincei V. 9: 104. 1913; A. cannabinum 

 var Suksdorfii Beg. & Bel. op cit. 105.) The plants that have been referred to these proposed species were all 

 considered conspecific with A. Suksdorfii by Woodson (Ann. Mo. Bot. Card. 17: 117. 1930). There seems to 

 be no essential difference between them and A. sibiricum var. salignum. They have the tubular-cyhndric corolla 

 2-3 mm. long including the erect lobes, and the distribution is essentially the same. Type locality: banks of the 

 Colimibia River. 



3. Apocynum medium var. floribundum (Greene) Woodson. Western Dogbane. 



Fig. 3828. 



Apocynum floribundum Greene, Erythea 1: 151. 1893. 



Apocynum viarum Heller, Muhlenbergia 2: 110. 1906. 



Apocynum vacillans Greene, Leaflets Bot. Obs. 2: 180. 1912. 



Apocynum riibicundum Greene, op. cit. 182. 



Apocynum medium var. floribundum Woodson, Ann. Mo. Bot. Gard. 17: 113. 1930. 



Apocynum cannabinum var. floribundum Jepsori. Fl. Calif. 3: 103. 1939. 



Plants glabrous throughout, the stems 2-5 dm. high, freely and more or less dichotomously 

 branched, the branches ascending. Leaves spreading, petioled or subsessile, ovate to lanceolate, 

 acute to obtuse at both the apex and base, or sometimes cordate; cymes terminal or sometimes 

 borne in the axils of the next to last pair of leaves; calyx-lobes 1.5-3 mm. long; corolla cylin- 

 dric, 4-5 mm. long, the lobes somewhat spreading, and slightly recurved follicles refiexed, 

 straight, 7-15 cm. long; seeds cylindric, 4 mm. long. 



Dry slopes or borders of meadows, Upper Sonoran and Transition Zones; Washington to southern Cali- 

 fornia, east to Montana, New Mexico and Texas; also in Chihuahua, according to Woodson. Type locality: Dry 

 ground bordering pine woods, in the higher mountains west of the Mohave Desert, in Kern County, Calitornia. 

 June-Aug. 



Apocynum medium var. vestitum (Greene) Woodson, Ann. Mo. Bot. Gard. 17: 116. 1930. (^. vesHtum 

 Greene, Man. Bay Reg. 240. 1894; A. incanum Greene, Leaflets Bot. Obs. 2: 164 1911.) Like the pre- 

 ceding species except the entire herbage is pubescent, even to the calyx. Rogue River, Oregon, to Napa Lounty, 

 California. Type locality: "Hills west of Napa Valley, in dry soil," California. The typical species has flowers 

 comparatively broader-campanulate, and leaves, at least the upper surface, tomentulose or sometimes glabrate. 

 It ranges from Nebraska and Texas to the Atlantic Coast. 



4. Apocynum androsaemifolium L. Spreading Dogbane. Fig. 3829. 



Apocynum androsaemifolium L. Sp. PI. 213. 1753; ed. 2. 311. 1762. 

 Apocynum ambigens Greene, PI. Baker. 3: 17. 1901. 

 Apocynum scopulorum Greene ex Rydb. Fl. Colo. 269. 1906. 

 Apocynum macranthum Rydb. Fl. Rocky Mts. 669. 1917. 



Stems erect or ascending, 2-5 dm. high, freely and somewhat dichotomously branching, the 

 branches ascending, alternate or subalternate, glabrous. Leaves opposite, drooping, distinctly 

 petioled, ovate to oblong-lanceolate, obtuse or rounded at base, acute and mucronate at apex, 

 3-9 cm. long, glabrous or essentially so ; cymes open ; calyx-lobes scarious, 1-2 mm. long some- 

 times colored, glabrous ; corolla pinkish, campanulate, 5-8 mm. long, the lobes reflexed ; folhcles 

 pendulous, straight, 6-15 cm. long; seed ovoid, 1 mm. long; coma pale tawny, 15-20 mm. long. 



Open coniferous forests. Transition Zone; British Columbia south to southern California east to Anticosti 

 and Georgia. Type locality: "Habitat in Virginia, Canada." June-Aug. 



Apocynum androsaemifolium var. incanum A. DC. Prod. 8:439. 1844. Essentially the same as the 

 typical species except that the leaves are pubescent or tomentose beneath. The same general range as the spe- 

 cies, and so far as the plants in the Pacific States are concerned scarcely worthy of taxonomic recognition. 

 Type locality: not given. 



