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 niunerous. Genliana 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 <hn. higli 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. Alont. 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 

 hnear-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; 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 imequal, 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, 5-8 mm. long; corolla 15-18 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. Plowers solitary and terrninal. 

 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 caly.x-lobes with broad scarious margins ; capsule long-stipitate, at last exserted 



from the corolla. 1- C. Fremontii. 



Leaves and calyx-lobes slightly scarious-margined ; capstile 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 mni. 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-.\u. 



6. DASYSTEPHANA Adans. Gentian. 

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

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

 sohtary and pedicelled. Calyx with a membrane inside the calyx-lobes, which 

 vary from obsolete to fohaceous. Corolla salverform, funnelform, or clavate, 

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

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

 Capsule stipitate. 



