658 GENTIANACEAE (GENTIAN FAMILY) 



erect or converging, short and broad, but distinct, and more or less longer than 

 the conspicuous 2-cleft and minutely toothed appendages. Moist woods, Ct. to 

 Ont., and south w. 



8. G. Andr6wsii Griseb. (CLOSED G.) Stems upright, smooth ; leaves 

 ovate-lanceolate and lanceolate from a narrower base, gradually pointed ; calyx- 

 lobes lanceolate to obovate, recurved, shorter than the top-shaped tube, and much 

 shorter than the more cylindric and truncate mostly blue corolla, which is closed 

 at the mouth, the proper lobes equaled by the broad notched appendages. 

 Moist ground, s. Me. to Man., and south w. Corolla blue with white plaits, or 

 sometimes all white. 



t- *- Margins of leaves, bracts, etc., smooth and naked; terminal flower-cluster 

 leafy-involucrate ; seeds winged. 



9. G. flavida Gray. Stems upright, stout ; flowers sessile and crowded in 

 a dense terminal cluster ; leaves ovate-lanceolate from a heart-shaped closely 

 clasping base, gradually tapering ; calyx-lobes ovate or subcordate, many times 

 shorter than the tube of the corolla, reflexed-spreading ; corolla white, more or 

 less tinged with greenish or yellowish, inflated-club-shaped, at length open, its 

 short and broad ovate lobes twice the length of the broad toothed appendages. 

 (G. alba Man. ed. 6, not Muhl.) Sandy woods and meadows, Ont. to Mo., 

 Ky., and Va. 



10. G. linearis Froel. Stems slender and strict, 2.5-7 dm. high ; flowers 1-5 

 in the terminal cluster; leaves linear or lanceolate, with somewhat narrowed 

 base ; bracts sometimes very finely scabrous ; calyx-lobes appressed-ascending, 

 linear or lanceolate, mostly subequal ; corolla blue or white, slender-funnel-form, 

 its erect roundish-ovate lobes a little longer than the triangular appendages. 

 (G. rubricaulis Schwein. ) Bogs and wet rocks, N. B. to Ont., Minn., N. Y., 

 and Md. 



Var. latifdlia Gray. Stout; leaves closely sessile, not contracted at base, 

 the lowest oblong-linear, the upper ovate-lanceolate; calyx-lobes unequal; 

 appendages broad, acute or subtruncate, mostly thrice exceeded by the corolla- 

 lobes. L. Superior ; N. B. 



*-*- +- Calyx-lobes and bracts with the margins smooth or nearly so; seeds 

 completely marginless. 



11. G. villbsa L. (SAMPSON'S SNAKEROOT.) Stems ascending, smooth ; 

 leaves from broadly obovate and obtuse to somewhat lanceolate, all narrowed 

 at base ; calyx-lobes linear, unequal, much longer than the tube, rather shorter 

 than the greenish-white open corolla, which is painted inside with green veins 

 and lilac-purple stripes ; corolla-lobes ovate, much exceeding the small sparingly 

 toothed oblique appendages. (G. ochroleuca Froel.) Dry or damp grounds, 

 N. J. and Pa. to Fla. and La. 



*** Anthers not connected; flowers terminal, solitary, commonly peduncled 

 and naked; seeds wingless. 



12. G. Porphyrio J. F. Ginel. Stems slender and ascending, 1-4.5 dm. high, 

 mostly simple ; leaves linear or the lower oblanceolate, rigid ; corolla open- 

 funnel-form, 4-6 crn. long, azure-blue, rarely greenish or white, about twice the 

 length of the thread-like calyx-lobes, its ovate spreading lobes twice as long as 

 the cut-toothed appendages. (G. angustifolia Michx.) Moist pine barrens, 

 N. J. to Fla. 



4. PLEUR6GYNE Esch. 



Acute divisions of the showy corolla with a pair of scale-like appendages at 

 base. Stamens inserted at base of corolla. Style none ; stigmas decurrent. 

 Small annuals of cold regions. (Name from ir\cvp6v, rib or side, and yw-f), 

 female; referring to the decurrent lateral, not terminal, stigmas.) 



1. P. rotata (L.) Griseb. (MARSH FELWORT.) Stem 0.5-3 dm. high, from 

 simple and 1 -flowered to fastigiate-branched and many -flowered ; leaves linear 

 or lanceolate, or the lowest spatulate ; sepals linear to lanceolate, resembling the 

 upper leaves, and often much elongated ; corolla blue or white, the 3-5 ovate- 



