144 GENT I AN ACE AE. 



1. CYNOCTONUM J. F. Gmel. Annual (ours) erect herbs. Flowers in 



terminal cymes, secund. Calyx usually 5-lobed. Corolla white or pale, urceo- 



late, somewhat longer than the calyx. Filaments almost completely adnate to 



the corolla-tube. Styles united by their tips in anthesis, ultimately distinct. 



Capsules miter-shaped, the 2 horns curved.- — Miterwort. 



Leaf-blades narrowed into petiole-like bases : inflorescence las. 1. C. Mitreola. 

 Leaf-blades sessile : inflorescence dense. 2. C. sessilifoUutn. 



1. C. Mitreola (L.) Britton. Stem 1-7 dm. tall: leaf -blades thin, oblong, 

 elliptic, lanceolate, or ovate, or sometimes narrower, 1.5-8 cm. loug, acute or 

 acuminate: corolla-lobes ovate to oblong-lanceolate: capsules 2-2.5 mm. long. 

 — Everglades and low pinelands. — F. 5- {Bah., Cuba, Ant.) 



2. C. sessilifolimn (Walt.) J. F. Gmel. Stem 1-5 dm. tall: leaf -blades thick, 

 ovate to orbicular, 1-5 cm. long, obtuse or apiculate: corolla-lobes ovate, 

 mainly shorter than the tube: capsules about 4 mm. long. — Pinelands. — F. K. 



2. POLYPREMUM L. Annual diffuse herbs. Flowers solitary in the 

 forks of the branches and in the leaf-axils. Calyx-lobes 4 or 5, narrow. 

 Corolla white, campanulate, shorter than the calyx. Filaments adnate to the 

 corolla-tube for about i their length. Styles very short, permanently united. 

 Capsules obovoid or subglobose. 



1. P. procumbens L. Stem and branches 1-3 dm. long: leaf -blades narrowly 

 linear to subulate, scabrous-margined: calyx-lobes narrowly lanceolate, about 

 3 mm. long: corolla-lobes suborbicular, slightly shorter than the tube: capsules 

 about 2 mm. long. — Pinelands. — F, K. {Bah., Cuba, Ant.) 



Family 2. GENTIANACEAE. Gentiax Family. 



Annual or perennial caulescent herbs, or rarely shrubs. Leaves 

 typically opposite: blades entire, sometimes connate. Flowers perfect, 

 solitary or variously clustered. Calyx of 2, 4 or 5, or more, partially 

 united"^ sepals, persistent. Corolla of 4 or 5 or more, partially united 

 petals, varying from rotate to tubular. Androecium of as many stamens 

 as there are corolla-lobes, the filaments partially adnate to the corolla- 

 tube. Gynoecium of two united eai'pels. Fruit a capsule. 



Corolla-lobes convolute in the bud : leafy plants, not saprophytic : stigmas distinct. 

 Corolla campanulate-funnelform : stigmas broad, capsule oblong to oval. 



1. EUSTOMA. 



Corolla rotate : stigmas narrow : capsule globose to ovoid. 2. Sabbatia. 



Corolla-lobes imbricate in the bud : nearly leafless plants, sapro- 

 phytic : stigmas united. 3. Leiphaimos. 



1. EUSTOMA Salisb. Annual relatively large herbs. Flowers solitary or 

 in open panicles. Calyx-lobes 5 or 6, narrow. Corolla white, blue, or purple, 

 campanulate-funnelform: lobes 5 or C, usually erose-denticulate, longer than 

 the tube. 



1. E. exaltatum (L.) Griseb. Stem 1-9 dm. tall: blades of the upper leaves 

 oblong to oblong-lanceolate, 1.5-7 cm. long: calyx-lobes 10-12 mm. long: 

 corolla mainly blue; lobes oblong or oval, 17-20 mm. long: capsules 2-2.5 cm. 

 long. — Pinelands and coastal sand-dunes. — F. K. {Bah., Cuba, Ant.) 



2. SABBATIA L. Annual or biennial relatively slender herbs. Flowers 

 solitary or in cymes. Calyx-lobes 4-12, narrow. Corolla white, or of the pale 

 tints, often with a distinct eye, rotate: lobes entire, longer than the tube. — 

 Marsh-pink. 



