GENTIAN FAMILY 661 



or the uppermost acute; flowers 1-3 in each axil; calyx-lobes linear, slightly 

 unequal, 3-7 mm. long; corolla blue or bluish, 10-15 mm. long; lobes acute or 

 obtuse; setae of crown numerous. Gentiana plebeia Cham. Mountains: Alaska 

 (? Calif.) Colo. Sask Mack.; e Asia. Mont. Subalp. Jl-Au. 



7. A. tortuosa (M. E. Jones) Rydb. Low annual, with spreading branches, 

 about 1 dm. high or less; leaves all linear or linear-lanceolate, 1-3 cm. long; 

 flowers numerous, fascicled in the axils; calyx-lobes subequal, about 6 mm. long; 

 corolla yellowish, 8-10 mm. long; crown in the throat well developed. Gentiana 

 tortuosa M. E. Jones. In meadows: South-central Utah. Mont. S. 



8. A. ventorum Rydb. Low annual or biennial, branched near the base; 

 stems 5-10 cm. long, branched; basal leaves oblanceolate; stem-leaves linear or 

 linear-lanceolate, about 2 cm. long; flowers 1-3 in the axils; calyx-lobes linear- 

 lanceolate, 3-5 mm. long, acute, scabrous on the margins; corolla about 5 mm. 

 long, 5 lobes ovate, obtuse or acute. Mountains: Wind River Mountains, Wyo. 

 Au. 



9. A. propinqua (Richards.) Greene. Annual, often branched near the 

 base; stems 0.5-3 dm. high, often purplish; basal leaves spatulate or oblanceolate, 

 1-2 cm. long; stem-leaves lanceolate, 1-2 cm. long, acute; flowers 1-3 in the 

 axils, on naked pedicels; calyx-lobes very unequal, the two outer ovate or oblong, 

 acute, 5-7 mm. long, the rest linear, 3-5 mm. long; corolla blue, 10-17 mm. long. 

 G. propinqua Richards. Moist slopes and glades: Alaska B.C. Alta. Mack.; 

 e Asia. Subalp. Alp. Jl-Au. 



10. A. arctophila (Griseb) Greene. Low annual, branching at the base; 

 branches 2-10 cm. high, decumbent; basal leaves spatulate or obovate, about 1 

 cm. long; stem-leaves 1 cm. or less long, acute; flowers 1-2 in the axils; calyx- 

 lobes ovate, 58 mm. long; corolla 1518 mm. long. G. arctophila Griseb. Arctic 

 coast: Alta. B.C. Alp. Au-S. 



5. CHONDROPHYLLA A. Nels. Moss GENTIAN. 



Small annuals or biennials. Leaves numerous, small, opposite, imbricate, 

 with white scarious or cartilaginous margins. Flowers solitary and terminal. 

 Calyx narrow, 4- or 5-lobed. Corolla salverform, plicate, with broad emarginate 

 plaits in the sinuses. Ovary 1-celled. Anthers versatile. Capsule more or 

 less stipitate. Seeds oblong, with close coat. 



Leaves and calyx-lobes with broad scarious margins ; capsule long-stipitate, at last exserted 

 from the corolla. 1. C. Fremontii. 



Leaves and calyx-lobes slightly scarious-margined ; capsule short-stipitate, not exserted. 



2. C. americana. 



1. C. Fremontii (Torr.) A. Nels. Low biennial, branched at the base, 

 1-10 cm. high; leaves glaucous and with broad white margins, the basal ones or- 

 bicular or obovate or ovate, about 5 mm. long; stem-leaves oblong to linear- 

 lanceolate, acute, appressed, 3-5 mm. long; calyx-tube 5-7 mm. long; corolla 

 10-15 mm. long, light greenish purple. Gentiana humilis A. Gray, not Stev. 

 Grassy banks in the mountains : Wyo. Colo. Alta. Subalp. Alp. Je-Jl. 



2. C. americana (Engelm.) A. Nels. Low biennial, branched at the base, 

 1-12 cm. high; leaves green, slightly if at all white-margined; basal ones orbicular 

 or obovate, 2-5 mm. long; stem-leaves ovate, about 5 mm. long, scarcely ap- 

 pressed; calyx-tube 5-8 mm. long; corolla 10-20 mm. long, azure-blue ; lobes ovate. 

 Gentiana prostrata americana Engelm. Alpine-arctic regions: Alaska Colo.- 

 Alta. Subalp. Alp. Je-Au. 



6. DASYSTEPHANA Adans. GENTIAN. 



Mostly perennial, rarely annual, caulescent herbs. Leaves opposite, entire 

 or merely erose-ciliolate. Flowers perfect, cymose, sessile or nearly so, rarel; 

 solitary and pedicelled. Calyx with a membrane inside the calyx 

 vary from obsolete to foliaceous. Corolla salverform, funnelform, or cL 

 without glands and crowns, but with cleft plaits between the convolute lobes 

 Stamens with converging or cohering anthers. Ovary 1-celled; ovules nu 

 Capsule stipitate. 



