APOCYNACEAE 99 



petioled (Vs line) or subsessile, 6 to 9 lines long, ■with smaller leaves fascicled in 

 the axils; cjrmes forming dense head-like whorls in the axils of the opposite leaves, 

 and thus interruptedly spieate at the ends of the branches; calyces densely tomen- 

 tose; corolla-tube narrow-campanulate, 2 to 2i/2 lines long, its limb salverform, 



1 to 1% lines wide. 



Montane slopes, 3000 to 6000 feet : Kingston Range, northeastern Mohave Des- 

 ert. East to southern Utah. May. 



LoC3. — Kingston (5 mi. sw.), ace. C. B. Wolf (Eep. Eancho Santa Ana Bot. Gard., Oct. 1935- 

 Apr. 1936, 15). Nev.: Indian Spr., Cliarleston Mts., Jones; Jean, Clark Co., K. Brandegee. 



Refs. — BUDDLEIA DTAHENSis Cov., Proc. Biol. Soc. Wash. 7:69 (1892), type loc. St. George, 

 s. Utah, Palmer; Contrib. U. S. Nat. Herb. 4:149, pi. 12 (1893). 



APOCYNACEAE. Dogbane Family 



Ours perennial herbs with milky juice. Leaves simple, entire and opposite. 

 Flowers complete, regular, 5-merous except the pistils which are 2. Calyx free or 

 nearly free from the ovaries, imbricated in the bud and persistent. Corolla-lobes 

 convolute in the bud. Stamens borne on the corolla alternate with its lobes; anthers 

 produced at base into a sterile appendage, connivent around the stigma. Ovaries 



2 and distinct (though their styles and stigmas are united into one), developing 

 into follicles. Embryo large, straight, in scanty albumen. — A family closely allied 

 to the milkweeds. Amsonia has alternate leaves. — Genera 130, species about 1000, 

 all continents but mostly tropical. 



Bibliog. — Brown, K., Apocineae (Mem. Wem. Nat. Hist. Soc. 1:59-78, — 1811). Greene, 

 E. L., New Species of ApoejTium (Pitt. 5:64-66, — 1902) ; Accessions to Apocynum (Lflts. 2: 

 164^189, — 1911-1912). Beguinot, A., & Beloserksy, N., Revisione monografica del genre Apo- 

 cynum L. (Atti Acead. Lincei, Mem. 01. Fis. ser. 5, 9:595-734, tt. 1-12,-1913); "more of a 

 curiosity than a scientific work" (R. E. Woodson). Woodson, R. E., Jr., Monograph of the genus 

 Amsonia (Ann. Mo. Bot. Gard. 15:379^35, pis. 51-53, — 1928) ; Studies in the Apoeynaceae (I.e. 

 17:1-212, figs. 1-9, pis. 1-18,-1930; 23:169-438, pis. 1-7,-1936); The identity and nomen- 

 clature of Apocynum androsaemifolium L. (Rhod. 34:30-31, — 1932). Macfarlane, J. M., The 

 evolution and distribution of * * * Apoeynaceae and Asclepiadaceae 1-181, with phyl. tables. 

 1933. Woodson, R. E., Jr., & Moore, J. A., The vascular anatomy and comparative morphology 

 of apocynaceous flowers (Bull. Torr. Club 65:135-166, pis. 3-5, — 1938). 



Stamens borne on the summit of the corolla-tube ; anthers free from the stigma ; buds sinistrorsely 

 convolute ; seeds not eomose. 



Leaves alternate ; flowers without glands 1. Amsonia. 



Leaves opposite ; flowers with 2 glands alternate with the carpels 2. ViNCA. 



Stamens borne on the base of the corolla-tube ; anther-cells produced at base into sterile appen- 

 dages connivent around the stigma and adnate to it by a point at the base of the fertile 

 portion; follicles not torulose; seeds eomose. 

 Style very short, not appendaged ; corolla-tube with 5 small appendages alternate vfith the 



stamens; buds dextrorsely convolute 3. Apocynum. 



Style filiform, bearing a conspicuous annular membrane ; corolla-tube with a minute appen- 

 dage behind each stamen; buds not convolute 4. Ctcladenia. 



1. AMSONIA Walt. 



Leaves numerous. Flowers in a terminal compound cyme. Corolla-lobes ro- 

 tate, its tube in ours dilated upwards, constricted at the mouth, within (below the 

 stamens) beset with reflexed hairs. Anthers free from the .stigma. Stigmas sub- 

 tended by a globose thickening (in ours). Follicles slender, torulose. — Species 5 

 in North America, 1 in Japan. (Charles Amson of South Carolina.) 



Herbage tomentose; sinuses of calyx rounded; stigma purplish 1. A. tomcntosa. 



Herbage glabrous; sinuses of calyx acute; stigma whitish 2. A. brevifolia. 



1. A. tomentosa Torr. & Frem. (Fig. 346.) Stems many from the crown of 

 a stout taproot, 8 to 15 inches high; herbage cinereous-tomentose; leaf -blades ovate 

 to lanceolate, acuminate, nearly sessile, 1 to 2 inches long; calyx-lobes apparently 



