MONOPETALOUS EXOGENOUS PLANTS. 443 



E. KussELLiANUM. Stem 2° liigh, square, glaucous, 

 paniculately forking; leaves ovate-lanceolate, 4' long, 2-3' 

 broad, amplexicaul; c«/i/a; bell-shaped, 5 -cleft ; 6'oro//« bell- 

 shaped, 5-cleft, withering-persistent, long-peduncled, ter- 

 minating the branches, rich purplish blue, 4-5' long; 

 stamens 5, slightly exserted, inserted on the middle of the 

 tube of the corolla; anthers sagittate; capsule oblong, 

 1-celled; style erect, conspicuous; stigmas round-ovate, 

 spreading; seeds minute. Around Independence, and in 

 all the rich, Mack prairies from Washington County to 

 Austin, 



GENTIANA, Tourn. Gentian. 



Calyx 4-5-parted ; corolla bell-shaped or funnel-shaped, 

 4-5-lobed, often with plaited toothed appendages between 

 the lobes; stamens 4-5; stigmas 2, sessile, compressed, 

 persistent ; capsule 1-celled, 2-valved, many-seeded, the 

 seeds sutural, or covering the inner face of the valves; 

 flowers showy, solitary or clustered, axillary and terminal. 



* Annual; corolla funnel-shaped, destitute of appendages ; anthers versatile; cap- 

 sule sessile ; seeds wingless. 



G. ANGUSTIFOLIA, Michx. Stem low, smooth, 1-flowered ; 

 leaves WxiQdiY, fleshy; calyx-lobes linear, erect, half as long 

 as the corolla; corolla large, bright blue, the lobes ovate, 

 twice as long as the broad toothed appendages. — Varies 

 with the corolla green without and white w^ithin. — Low 

 pine-barrens. November and December. Stem 4'-10' 

 high ; corolla 2' long. 



BARTONIA, Muhl. 



Calyx 4-parted; corolla 4-parted; stamens 4; anthers 

 small; stigmas sessile; capsule 1-celled, 2-valved, septici- 

 dal ; seeds covering the inner surface of the valves. — Small 

 annual herbs, with erect filiform stems, scale-like subulate 

 leaves, and yfhiiQ flowers. 



