GENTIANACEAE (GENTIAN FAMILY) 383 



leaves 6-16 pairs, ovate or oblong-lanceolate: flowers from numerous and 

 thyrsoid-racemose to few or rarely almost solitary; bracts lanceolate' or linear: 

 calyx-lobes linear or subulate, unequal and variable, the longest rarely equal- 

 ing the tube, the shorter sometimes minute: corolla 2-3 cm. long, rather 

 narrowly funnelform; the lobes ovate, acutish or mucronulate-pointed, spread- 

 ing; the laciniate-toothed or cleft appendages at the sinuses sometimes almost 

 equaling the lobes. (G. interrupta Greene, 1. c. 182.) Very frequent at mid- 

 dle elevations in our range. 



11. Gentiana Forwoodii Gray, Proc. Am. Acad. 19: 86. 1883. Resembling 

 G. affinis, but the corolla decidedly smaller, about 18 mm. long, narrow, and 

 with shorter and rounder lobes, these little surpassing the plicate append- 

 ages: stems equably leafy to the very top: calyx subcampanulate, with no 

 vestige of lobes or teeth. Rare in Colorado and Utah but frequent in north- 

 western Wyoming. 



12. Gentiana Bigelovii Gray, 1. c. 87. Near G. affinis, very leafy: leaves 

 thick; the lower lanceolate-oblong; the upper linear and the floral often much 

 exceeding the flowers: stems 1-3 dm. high, somewhat scabrous: flowers densely 

 spicate: calyx-teeth very slender, as long as the tube: corolla 20-25 mm. 

 long, slightly scabrous on the outside; the lobes short, broadly ovate, twice as 

 long as the bifid appendages: stipe of the capsule short and fistulous. 

 Colorado to New Mexico and Arizona. 



13. Gentiana Andrewsii Griseb. in Hook. Fl. Bor. Am. 2: 55. 1834. Stems 

 upright, smooth: leaves ovate-lanceolate: calyx-lobes lanceolate, half as long 

 as the tube: corolla blue, with pale streaks, somewhat cylindric-clavate, 

 nearly closed at the mouth, twice as long as the calyx, nearly truncate at the 

 summit with the lacerate appendages as long as the lobes. Infrequent; 

 stream banks of northern Colorado. Apparently our plants are not identical 

 with the eastern form of this species. 



6. SWERTIA L. 



Simple-stemmed perennials, occasionally with alternate leaves, the lower 

 at least tapering into margined petioles. Inflorescence thyrsoid; flowers blue 

 or purple, varying to white. Corolla rotate, 4- or 5-lobed. Style very short 

 or none; stigma 2-lobed or 2-lamellate. Capsule ovate. 



Flowers 4-merous . . . . . . >, .1. S. scopulina. 



Flowers 5-merous. 



Inflorescence elongated; corolla-lobes oblong or narrower . . . 2. S. palustris. 



Inflorescence capitate-congested; corolla-lobes elliptic to oval . . 3. S. congesta. 



1. Swertia scopulina Greene, Pitt. 4: 184. 1900. Plant 1-4 dm. high: 

 inflorescence very strict : leaves broadly ob lanceolate or spatulate-oblanceolate; 

 radical leaves very large, often more than half the length of the subscapi- 

 form stem, usually all, even the lowest and largest cauline ones, alternate, with 

 broad- winged petioles and half-clasping: flowers 4-merous: sepals lanceolate- 

 subulate, often 3-nerved, and three fourths as long as the corolla-lobes; these 

 10-14 mm. long, dark blue-purple: glands subulate-fringed: seeds round- 

 obovate varying to somewhat quadrangular, very distinctly winged on one, 

 two, or three sides, the testa wrinkled. Colorado and New Mexico. 



2. Swertia palustris A. Nels. Bull. Torr. Bot. Club 28: 227. 1901. Stems 

 simple, erect, glabrous, 2-3 dm. high: leaves glabrous, thin, entire or rarely 

 denticulate; radical leaves oblong to elliptic, obtuse, 5-10 cm. long; stem leaves 

 several, generally in pairs but not rarely alternate, spatulately oblanceolate 

 or broader: inflorescence very strict; peduncles erect, axillary to the bracts 

 and uppermost leaves, 1-3-flowered; flowers 5-merous: sepals subulate- 

 lanceolate, delicately nerved, about half as long as the petals: corolla-lobes 

 dark blue shading to purple, oblong, obtuse, about 10 mm. long, 3-4 mm. 

 broad; glands orbicular, the appendages few (10 or less), short-subulate: 

 seeds lenticular, wing-margined. Shaded mountain bogs; Wyoming and 

 Colorado. 



