GENTIAN FAMILY 659 



Filaments hairy at the middle. 2. A. Macounii. 



Filaments glabrous. 3. A. tonsus. 



All calyx-lobes lanceolate, the inner not twice as broad as the outer ones; stem- 

 leaves oblong or lanceolate. 

 Inner .calyx-lobes decidedly broader than the outer; corolla-lobes distinctly 



fringed on the sides. 4. A. thermalis. 



Inner calyx-lobes slightly broader than the outer; corolla-lobes dentate, rarely 



with a few bristles on the sides. 5. A. simplex. 



Perennials with a taproot; flowers short-peduncled in the axils of two bract-like leaves. 



6. A. barbellatus. 



1. A. ventricosus (Griseb.) Rydb. Stem simple or branched above, 2-3 

 dm. high, slightly angled; basal leaves spatulate, 1-1.5 cm. long; stem-leaves 

 lanceolate to oblong-ovate, about 3 cm. long; calyx nearly 2 cm. long, ventricose, 

 wing-angled; outer sepals lanceolate, long-acuminate, the inner broader, acute; 

 corolla-lobes elliptic, serrate-fimbriate. Gentiana ventricosa Griseb. Wet places: 

 Hudson Bay Sask. Baikal. 



2. A. Macounii (Holm.) Rydb. Stem strict, angular, 0.5-3 dm. high, 

 branched near the base; basal leaves spatulate or oblanceolate, 1-2 cm. long, 

 obtuse; stem-leaves acute, 2-3 cm. long; calyx purplish green; tube about 1 cm. 

 long; lobes acuminate, the outer about 10 mm. long; corolla deep bluish, 1.5-3 

 cm. long; lobes broadly obovate, toothed at the summit and fringed on the sides, 

 veiny. G. Macounii Holm. Prairies, gravelly soil, and edges of marshes: James 

 Bay Alta. Mont B.C. Boreal Submont. Jl-S. 



3. A. tonsus (Lunell) Rydb. Stem branched above, 3-4 dm. high, slightly 

 angled; basal leaves oblanceolate or spatulate-obtuse, 1-2 cm. long; stem-leaves 

 4-7 cm. long; calyx-tube about 1 cm. long; outer lobes 10-14 mm. long; inner, 

 8-12 mm. long, 3-4 times as broad as the outer; corolla blue or purple, 3-4 cm. 

 long; lobes oblong to obovate, fimbriate-toothed around the summit. Gentiana 

 detonsa tonsa Lunell. Wet meadows: Sask. Minn. Alta. Plain. Jl-S. 



4. A. thermalis (O. Kuntze) Rydb. Stem 2-3 dm. high, angled, usually 

 branched near the base; basal leaves spatulate, obovate or oblanceolate, 1-3 cm. 

 long, obtuse, tapering below; stem-leaves sessile, 2-4 cm. long; calyx angled, 

 green, with purple spots; tube 10-15 mm. long; lobes 8-15 mm. long, acuminate; 

 corolla 3-5 cm. long, bluish to purple, veined; lobes obovate-oblong, dentate 

 around the apex, usually fimbriate on the sides; filaments broadly winged, 

 naked. G. elegans A. Nels. G. lineata Greene. G. thermalis Kuntze, based on 

 depauperate specimens. Wet mountain meadows: Mack. Colo. Ariz. Ida. 

 Submont. Subalp. Jl-Au. 



5. A. simplex (A. Gray) Rydb. Stem 1-2 dm. high, 1-flowered; leaves 

 linear-oblong to lanceolate, about 1 cm. long; calyx scarcely angled; lobes almost 

 equal; corolla 1.5-2 cm. long; lobes oblong-spatulate, erose-dentate on the sides 

 below. Mountain meadows: Calif. Ida. Ore. Submont. Subalp. Jl-Au. 



6. A. barbellatus (Engelm.) Rydb. Stem angled, 5-15 cm. high, branched 

 at the base; basal leaves thick and fleshy, oblanceolate or spatulate, 3-5 cm. long; 

 stem-leaves linear or linear-oblanceolate, 3-4 cm. long; bracts linear, 2-3 cm. 

 long; calyx-tube about 1 cm. long; outer lobes linear-lanceolate, 10-15 mm. long; 

 inner ones ovate-lanceolate, shorter; corolla bright blue, 3-4 cm. long; lobes 

 oblong, erose-dentate above, conspicuously fimbriate on the sides. G. barbellata 

 Engelm. G. Moseleyi A. Nels. High mountains: Colo. Wyo. Mont. Alp. 

 Au-S. 



4. AMARELLA Gilib. GENTIAN. 



Annual, biennial or perennial herbs. Leaves opposite, entire, sessile. Flow- 

 ers perfect, solitary or cymose, 4-merous or 5-merous. Calyx-lobes imbricate, 

 the outer two often somewhat larger, without a membrane within the lobes. 

 Corolla funnelform or salverform; lobes entire or sparingly toothed, but without 

 plaits in the sinuses. Ovary 1-celled; ovules numerous. 



Corolla with a fringed crown in the throat; glands at the base of the corolla obsolete or 



wanting. - 



Flowers solitary on 2-10 cm. long peduncles; stems depressed, cespitose. 



1. A. monantha. 



