GENTIAN FAMILY 663 



5. D. calycosa (Griseb.) Rydb. Stems 1-3 dm. high, ascending, erect or 

 decumbent; internodes short, about equalling the leaves; leaves 2-3 cm. long, 

 3-5-ribbed; flowers usually solitary, sessile, and subtended by the upper broad 

 leaves; calyx-lobes ovate, foliaceous, 7-10 mm. long, obtuse; corolla dark blue, 

 or (in var. xantha A. Nels.) yellow, green-spotted, 3-4 cm. long; lobes ovate, 

 triangular-acute at the apex; plaits with a lanceolate, more or less laciniate, 

 acuminate prolongation, half as long as the corolla-lobes or longer. G. calycosa 

 Griseb. High mountains: Wash. Calif. w Wyo. Mont. Subalp. Jl-S. 



6. D. xnonticola Rydb. Stem about 1 dm. high, erect; internodes usually 

 shorter than the leaves; leaves 3-ribbed; flowers solitary and sessile, subtended 

 by the broad upper leaves; calyx-tube 7-9 mm. long; lobes lance-ovate, 8-10 

 mm. long; corolla dark blue, about 3 cm. long; lobes of the plaits lanceolate, 

 acuminate, laciniate or toothed, half as long as the corolla-lobes or longer. High 

 mountains : Wash. Mont. nw Wyo. Mont. Subalp. Au. 



7. D. Parryi (Engelm.) Rydb. Stems erect or ascending, many-leaved, 

 1-4 dm. high; leaves from linear-lanceolate to ovate, fleshy and somewhat glau- 

 cous, 1.5-4 cm. long; flowers 1-6 at the summit of the stem; calyx-tube 10-15 

 mm. long, white and scarious; lobes linear or lanceolate, 4-8 mm. long; corolla 

 bright blue, about 4 cm. long; lobes obovate, acute; lobes of the plaits ovate, 

 usually 2-cleft, toothed, two-thirds as long as the corolla-lobes. G. Parryi 

 Engelm. G. bracteosa Greene. High mountains: Wyo. Colo. Utah. Mont. 

 Subalp. Jl-S. 



8. D. oregana (Engelm.) Rydb. Stems erect, . 3-4 dm. high, leafy; leaves 

 2-4 cm. long, 3-5-ribbed, acutish or obtuse, rounded to acute at the base; flowers 

 short-pedicelled in the upper axils; calyx- tube about 1 cm. long; lobes 5-8 mm. 

 long; corolla purple, 3-3.5 cm. long; lobes ovate, acute; lobes of the plaits tri- 

 angular, with 2 acuminate lobes. G. oregana Engelm. Meadows: Wash. 

 Calif. Mont. Submont. Jl-S. 



9. D. afflnis (Griseb.) Rydb. Stems 1-3 dm. high, leafy; leaves 1.5-3 cm. 

 long; calyx-tube 5-7 mm. long; lobes 2-10 mm. long, acute; corolla blue or 

 purple, 2.5-3 cm. long; lobes ovate, acute; lobes of the plaits ovate, 2-cleft, 

 acuminate, laciniate, two-thirds as long as the corolla-lobe. G. affinis Griseb. 

 Mountains and hills: B.C. (? Calif.) Colo. Sask. Mont. Subalp. Au-S. 



10. D. Forwoodii (A. Gray) Rydb. Closely related to D. affinis; stem 

 1-3 dm. high, leafy; leaves 1.5-3 cm. long, rather thick; flowers short-pedicelled 

 in the upper axils, forming a dense spike-like inflorescence; calyx-tube 5-8 mm. 

 long, usually purplish; corolla blue or purple, about 3 cm. long; lobes obovate, 

 acute; lobes of the plaits 2-cleft, lanceolate, acuminate, a little shorter than the 

 corolla-lobes. G. Forwoodii A. Gray. Hills and mountains: Alta. Colo. Ida. 

 Submont. Mont. Jl-Au. 



11. D. Bigelovii (A. Gray) Rydb. Stem 2-3 dm. high, erect; lower leaves 

 oblong, the upper linear or lance-linear; floral leaves and calyx-lobes glandular- 

 ciliolate; flowers short-pedicelled in the upper axils, forming a many-flowered 

 spike; calyx-tube 5-6 mm. long; lobes linear-subulate, 5-7 mm. long; corolla 

 cylindro-funnelform, 2-2.5 cm. long; lobes acute; lobes of the plaits triangular, 

 2-cleft, acute, half as long as the corolla-lobes. G. Bigelovii A. Gray. Moun- 

 tains: Colo. N.M. Ariz. Submont. Au-O. 



12. D. interrupta (Greene) Rydb. Stem 3-4 dm. high; lower leaves ovate 

 or oblong, 1-2 cm. long, the upper narrowly linear, 2-4 cm. long; lower flowers 

 on peduncles 1-2 cm. long; calyx-tube 5-6 mm. long; lobes linear or subulate, 

 2.5-4 mm. long; corolla open-funnelform, 2.5-3 cm. long; lobes obovate; lobes 

 of the plaits 2-cleft; divisions lanceolate, acute, two-thirds as long as the corolla- 

 lobes. G. interrupta Greene. Mountains: Wash. Ore. Colo. Sask. Sub- 

 mont. Au-S. 



13. D. puberula (Michx.) Small. Stem strict, erect, 3-5 dm. high, more 

 or less scabrous, leafy; leaves lanceolate, firm, scabrous-puberulent on the mar- 

 gins and midrib, paler beneath, 3-5 cm. long; flowers subsessile, forming a dense 

 spike; calyx-tube not scarious, about 1 cm. long; lobes subulate, 8-12 mm. long, 



