I 



GENTIANACEAE. 



Vol. III. 



10. Dasystephana Porphyrio (J. F. Gmel.) Small. 

 One-flowered Gentian. Fig. 3362. 



Gentiana purpurea Walt. Fl, Car. 109. 1788. Not. L. 1753. 

 Gentiana Porphyrio J. F. Gmel. Syst. 2: 462. 1791. 

 Gentiana angustifolia Michx. Fl. Bor. Am. 1 : 177. 1803. 

 D. Porphyrio Small, Fl. SE. U. S. 931. 1903. 



Perennial, glabrous; stem erect or ascending, simple or 

 branched, 6-18' high. Leaves linear, firm, acute or blunt 

 at the apex, 1-2' long, i'-z" wide, or the upper and 

 lower shorter; flow : ers solitary at the ends of the stem 

 or branches, short-peduncled, about 2' high, not bracteo- 

 late under the calyx ; calyx-lobes linear, longer than the 

 tube; corolla funnelform, bright blue, sometimes brown- 

 dotted within, its lobes ovate, acutish, spreading, S"-7" 

 long, three times as long as the conspicuously laciniate 

 appendages, or more; seeds oblong, wingless. 



In moist pine barrens, New Jersey to Florida. Aug.-Oct. 



6. PLEUROGYNA Fschol. Linnaea 1 : 1S7. 1826. 



Slender usually branched annual glabrous herbs, with opposite leaves, and rather large 

 blue or white flowers in terminal narrow racemes or panicles, or solitary at the ends of the 

 slender peduncles. Calyx deeply 4-5-parted ; segments narrow, often unequal. Corolla rotate, 

 4-5-parted ; lobes vate or lanceolate, convolute, acute, with a pair of narrow appendages at 

 the base. Stamens 4 or 5, inserted on the corolla-tube near its base ; filaments slender or 

 filiform; anthers ovate, sagittate, straight. Ovary i-celled; ovules numerous; style none; 

 stigma decurrent along the sutures of the ovary. Capsule 2-valved. Seeds small and numer- 

 ous. [Greek, referring to the lateral stigmatic surfaces.] 



About 7 species, of the colder parts of the northern hemisphere, only the following typical one 

 in North America. 



i. Pleurogyna rotata (L.) Griseb. Marsh Felwort. 



Fig- 33 6 3- 



Swertia rotata L. Sp. PI. 226. 1753. 



Pleurogyne rotata Griseb. Gent. 309. 1839. 



Stem erect, usually 6-15' high, sometimes lower, simple, 

 or with nearly erect branches. Leaves linear to lanceolate, 

 i'-2' long, 1 "-2" wide, or the basal spatulate or oblong, 

 shorter and sometimes broader; sepals narrowdy linear to 

 lanceolate, about the length of the lanceolate to' oblong- 

 lanceolate corolla-segments which are 4"-/" long; capsule 

 narrowly oblong. 



Quebec. Greenland and Labrador to Alaska, south in the 

 Rocky Mountains to Colorado. Recorded from the White 

 Mountains of New Hampshire. Also in Europe and Asia. 

 Summer. 



7. FRASERA Walt. Fl. Car. 87. 1788. 



Perennial or biennial erect glabrous mostly tall herbs, with opposite or verticillate leaves, 

 and rather large white yellowish or bluish flowers, in terminal cymose panicles or thyrses. 

 Calyx 4-parted, the segments narrow. Corolla rotate, 4-parted, the lobes convolute in the 

 bud, each bearing 1 or 2 fimbriate or fringed glands within. Stamens 4, inserted on the base 

 of the short corolla-tube; filaments subulate or filiform, sometimes united at the base; anthers 

 oblong, versatile. Ovary ovoid, I-celled ; style slender or short, but distinct ; stigma 2-lobed 

 or nearly entire. Capsule ovoid, coriaceous, somewhat compressed, 2-valved, few-seeded. 

 Seeds flattened, smooth, margined or narrowdy winged. [In honor of John Fraser, a botan- 

 ical collector.] 



About 15 species, natives of North America, all but the following typical one far western. 



