286 THE FLORA. 



1 S. gentianoi'des. Gentian C. Leaves linear, rigid, longer than the internod'^s 



Flowers 8-10-parted, bright flesh-color, clustered. S. 



2 S. chloroi^des. Chlora 0. Leaves lanceolate. Branches few, alternate, each 



bearing at top a solitary, 7-12-parted, bright purple flower. E. 



3 S. calyco''sa. Cup G. Calyx leafy, as large as the 5-6-parted corolla. S. 



4 S. panicula'ta. Panicled C. Sepals linear, half as long as 5-parted cor. S. 



5 S. gra'cilis. Slender G. Leaves ovate to linear. Sepals bristle-form, as long as 



the corolla. M. S. 

 •; S. stella^ris. Starry G. Leaves lance-obovate. Sepals linear, much shorter than 



corolla, c. 



7 S. corymbo''sa. Gorymhed G. Leaves lanceolate, 3-veined. Calyx segmenta 



linear, thrice longer than its tube, half as long as the corolla. N.-J. S. 



8 S. macrophyl'la. Leaves 5- veined, cusp-pointed. Sepals shorter than calyx 



tube. S. 

 9 S, angularis. Angled G. Stem square, with winged angles. Leaves ovate, 

 clasping, 5-veined. Flowers many, rose-red, the star greenish. Wet. c. 

 10 S. brachia'ta. Prairie G. Stem square, slender, joints 2-4 times longer than the 

 sessile, lance-linear leaves. Panicle oblong. Corolla 6-parted, the star 

 yellow. W. S. 



Order XCYL APOCYNACEJE. Dogbanes. 



Plants with a milky juice^ entire and mostly opposite leaves ; 

 flowers 5-parted and regular, with the corolla twisted in the bud ; 

 stamens 5, with distinct filaments, anthers sometimes slightly united ; 

 ovaries 2, distinct, but with their stigmas united at top of the styles ; 

 fruit 2 follicles containing several or many albuminous seeds. 



Analysis of the Genera. 



* Herbs erect, 2-4f. high, the flowers in cymes a 



* Shrubs twining or trailing, with opposite leaves b 



* Shrubs erect, 3-6f. high, with the leaves in whorls of 8 c 



a Cor. bell-shaped, whitish. Style none. Sds. silky. DogU-hane. Apoc'ynum. 1 

 a Corolla funnel-form, bluish. Style 1. Lvs. scattered. Amson. Amso^nia. 



b Fls. solitary, blue. Throat 5-angled. Lvs. evergreen, t Periwinkle. Vin''ca. 



b Flowers in cymes, yellow, small. Lvs. petiolate. Wet. South. Forstero''nia. 

 c Leaves thick, evergreen. Flowers large, rose-colored. Gleand-er. Nk'rium. 



APOCYNUM. Dog's-bane. 



Stamens shorter than the corolla, arising from its base, and alternate 

 with 5 glandular teeth. Anthers arrow-shaped, cohering to the stigmas 



