930 GENTIAN ACEAE 



7. DASYSTEPHANA A dans. 

 Annual, biennial or mainly perennial herbs. Leaves opposite: blades entire or essen- 

 tially so, but the margins often more or less ciliolate-scabrous or erose. Flowers perfect, 

 commonly sessile and clustered, rarely solitary and pedicelled, the whorls mainly of 5 parts 

 each. Calyx persistent : lobes minute or foliaceous, smooth and glabrous or ciliolate- 

 scabrous. Corolla salverform, funnelform or clavate, with neither glands at the base of the 

 tube nor filaments at the base of the lobes : lobes converging, erect or spreading, accom- 

 panied by plaits in the sinuses. Stamens with converging or cohering anthers. Ovary 

 1-celled. Ovules numerous, mainly over the whole ovary -cavity. Capsule stipitate. The 

 plants Hower in 'summer and fall. Gentian. 



Calyx-lobes ciliolate-scabrous. 



Corolla open funnelform : anthers separate, often converging. 1. D. pubcmla. 



Corolla campanulate-funnelform or clavate : anthers coherent into a ring or tube. 

 Corolla-lobes larger than the plaits, surpassing them or equalling them in length. 

 Corolla-lobes much longer than the plaits : stem pubescent. 

 Calyx-tube glabrous. 



Leaf-blades rounded or subcordate at the base : corolla-plaits with 2 



unequal fimbriate lobes. 2. B. parvifolia. 



Leaf-blades narrowed at the base : corolla-lobes with 2 equal nearly 



entire lobes. " 3. D. latifoUa. 



Calyx-tube pubescent. 4. D. decora. 



Corolla-lobes about as long as the plaits : stem glabrous. 5. D. Saponaria. 



Corolla-lobes minute or obsolete. 6. D. Andreivsii. 



Calyx-lobes smooth and glabrous or essentially so. 



Flowers sessile, clustered : corolla-plaits entire or 1-2-toothed. 7. B. villosa. 



Flower solitary, pedicelled : corolla-plaits fimbriate. 8. D. Poiyhijrio. 



1. Dasystephana puberula (Michx.) Small. Stems 2-4.5 dm. tall, finely pubescent 

 or rather puberulent : leaf-blades lanceolate to oblong-lanceolate, 2.5-4 cm. long, slightly 

 revolute, sessile : calyx about 2 cm. long ; lobes linear to narrowly linear-lanceolate, about 

 as long as the tube : corolla rose-purple, 3.5-4.5 cm. long, campanulate-funnelform ; lobes 

 ovate, 9-12 mm. long, spreading, much larger than the cleft and laciniate plaits : capsule- 

 body about 2 cm. long : seeds oblong, conspicuously winged. [Gentiana puberula Michx.] 



In dry or stony soil, Ohio to the Northwest Territory, Georgia and Kansas. 



2. Dasystephana parvifolia (Chapm. ) Small. Stems 3-7 dm. tall, finely pubescent : 

 leaf -blades ovate to lanceolate or oblong-lanceolate, 1-4.5 cm. long, rounded or subcordate at 

 the base : calyx 2.5-3 cm. long ; lobes erect, linear-elliptic to almost linear, much longer than 

 the glabrous tube : corolla rose-purple, 4-5 cm. long, funnelform ; lobes ovate, much longer 

 than the unequally cleft and fim})riate plaits : capsule-body about 2.5 cm. long : seeds con- 

 spicuously winged. [Gentiana Elliottii Chapm., not Kaf. G. EUiotlii var. parvifoJia Chapm.] 



On river banks and in ditches, Virginia to Florida. 



3. Dasystephana latifolia (Chapm.) Small. Stems 3-5 dm. tall, finely pubescent : 

 leaf-blades oblong to broadly elliptic, or sometimes nearly linear, 2-8 cm. long, more or less 

 narrowed at the base: calyx 1.5-2.5 cm. long ; lobes spreading, linear to linear-lanceolate, 

 ■about as long as the glabrous tube or sometimes slightly shorter or longer : corolla rose- 

 purple, 4-5 cm. long, funnelform ; lobes ovate, relatively narrower and more acute than 

 Uhose of D. parvifolia, much longer than the nearly equally cleft and almost entire plaits : 

 capsule-body nearly 2.5 cm. long : seeds conspicuously winged. [^Gentiana Elliottii var. 

 latifolia Chapm. ] 



In moist soil, especially on river banks, Virginia to Florida and Alabama. 



4. Dasystephana decora (Pollard) Small. Similar to G. hdifolia in habit: leaf- 

 blades thinner and more decidedly acuminate : calyx less than 1.5 cm. long ; lobes spread- 

 ing, subulate to linear-subulate, shorter than the pubescent tube : corolla purple, 2.5-3 cm. 

 long ; lobes ovate, much longer than the cleft plaits : capsule-body about 2 cm. long : seeds 

 winged. \_Gentiana decora Pollard.] 



In moist soil, in mountain woods, Virginia to Georgia. 



5. Dasystephana Saponaria (L. ) Small. Stems 3-8 dm. tall, glabrous: leaf-blades 

 lanceolate to oblong or elliptic, 2.5-7.5 cm. long : calyx 1.5-2 cm. long ; lobes spatulate to 

 linear-spatulate, mainly slightly shorter than the glabrous tube : corolla blue or pur{)lish 

 blue, 3.5-4 cm. long ; lobes broad, scarcely, if at all, longer than the broad cleft and many- 

 toothed plaits: capsule-body fully 1.5 cm. long: seeds winged. [^Gentiana Saponaria Ij.'\ 



In swamps and moist soil, Ontario to Minnesota, Florida and Louisiana. 



6. Dasystephana Andr^wsii (Griseb. ) Small. Stems 3-6 dm. tall, glabrous : leaf- 

 blades lanceolate varying to linear-lanceolate or more often ovate-lanceolate, mainly 4-9 

 cm. long, acute or acuminate : calyx 1 cm. or barely 1.5 cm. long ; lobes elliptic, oval 



