660 GENTIANACEAE 



Flowers numerous, short-peduncled ; stem erect, more leafy, simple at the base. 



Calyx-lobes very unequal, the outer two large, foliaceous, ovate or oval, much 

 broader than the rest. 2. A. heterosepala. 



Calyx-lobes somewhat unequal, but all oblong, lanceolate, or linear. 

 Stem-leaves lanceolate or broader. 



Flowers mimerous, crowded, very short-pedicelled, the whole inflorescence 

 dense and spike-like; leaves usually equalling or exceeding the 

 internodes. 3. A. strictiflora. 



Flowers comparatively few, distinctly pedicelled; middle internodes elon- 

 gate and usually longer than the leaves. 



At least the outer calyx-lobes lance-oblong; stem-leaves, except the 

 uppermost, oblong or oval, obtuse. 4. A. anisoscpala. 



Calyx-lobes linear or linear-lanceolate; stem-leaves lanceolate or ovate- 

 lanceolate, acute. 



Larger calyx-lobes usually half as long as the corolla 01 longer ; plant 

 stout, 2-4 dm. high; stem-leaves lanceolate. 5. A. scopulorum. 

 Calyx -lobes less than half as long as the corolla ; plant slender, 1-2 dm. , 

 seldom 3 dm. high; stem-leaves usually ovate-lanceolate. 



6. A. plebeia. 



Stem-leaves linear or linear-lanceolate. 7. A. tortuosa. 



Corolla without a crown; glands at the base of the corolla evident. 



Corolla-lobes obtuse or merely acute, not cuspidate; leaves narrowly linear-lanceolate. 



8. A. ventorum. 

 Corolla-lobes cuspidate-tipped. 



Stem-leaves lanceolate, rarely ovate-lanceolate; corolla-lobes lanceolate to ovate. 



9. A. propinqua. 

 Stem-leaves ovate; corolla-lobes broadly ovate. 10. A. arctophila. 



1. A. monantha (A. Nels.) Rydb. Low annual, less than 1 dm. high, 

 usually with a few decumbent branches at the base; leaves oblong to spatulate, 

 5-10 mm. long; calyx-lobes only slightly unequal, oblong-lanceolate, acutish; 

 corolla about 12 mm. long; lobes lanceolate, acute. Gentiana monantha A. Nels. 

 High mountains: Colo. Utah Ida. Mont. Subalp. Jl-S. 



2. A. heterosepala (Engelm.) Greene. Strict annual, 2-3 dm. high; basal 

 leaves and lower stem-leaves spatulate, 1-3 cm. long, rounded or obtuse at the 

 apex; upper leaves lanceolate, strongly 3-ribbed, acute or obtusish at the apex, 

 2.5-4 cm. long; flowers 1-3 in the axils of the leaves; corolla 10-15 mm. long; 

 bristles of the crown numerous. Gentiana heterosepala Engelm. A. distegia 

 Greene. ? G. polyantha A. Nels., a many-flowered form. Mountains: Utah- 

 Colo. N.M. Submont. Mont. Jl-Au. 



3. A. strictiflora (Rydb.) Greene. Strict annual; stem 2-4 dm. high, 

 simple or with erect branches; basal leaves spatulate, 2-3 cm. long; upper stem- 

 leaves lanceolate, 3-5-ribbed, 2-5 cm. long, acute or acuminate; calyx-lobes 

 moderately unequal, linear or lanceolate, acute, 5-8 mm. long; corolla 8-12 

 (rarely 14) mm. long, varying from greenish yellow to azure or white, with blue 

 lobes; crown well developed, but setae often rather few. G. strictiflora (Rydb.) 

 A. Nels. A. conferta Greene. Wet meadows and open woods: Alaska Calif. 

 Colo. Sask. Submont. Subalp. Jl-S. 



4. A. anisosepala Greene. Strict annual; stem simple, or with a few 

 ascending branches, 1-3 dm. high; basal leaves obovate or spatulate, 1-3 cm. 

 long; middle stem-leaves oblong to oval, 1.5-3 cm. long, rounded at the apex; 

 uppermost leaves lanceolate or ovate, acutish or obtuse; flowers mostly 1-3 in 

 the axils, on naked pedicels; the longer calyx-lobes 6-10 mm. long, the smaller 

 4-6 mm.; corolla 8-10 mm. long, blue; lobes usually obtuse; crown well de- 

 veloped. G. anisosepala Greene. Wet woods: B.C. Wash. Wyo. Mont. 

 Submont. Mont. Je Au. 



6. A. scopulorum Greene. Annual; stem 2-4 dm. high, simple or with 

 ascending branches; basal leaves spatulate, 1-3 cm. long, obtuse; stem-leaves 

 lanceolate, often acuminate at the apex, 2-6 cm. long; flowers 1-4 in the axils 

 of the leaves, usually on naked pedicels; calyx-lobes linear, acute, the longer 

 10-12 mm. long; corolla 15-18 mm. long, blue or rarely greenish yellow; lobes 

 ovate-lanceolate, acute; crown well developed. Gentianella dementis Rydb. 

 Mountains: Mont. Ariz. N.M. N.D. Submont. Subalp. Jl-Au. 



6. A. plebeia (Cham.) Greene. Strict annual; stem simple or with a few 

 branches, 1-3 dm. high; basal leaves spatulate, 1-3 cm. long, obtuse; stem- 

 leaves oblong, elliptic, or lanceolate, 1-3 cm. (usually about 2 cm.) long, obtuse 



