GENTIAN ACE^. Ill 



4. EUSTOMA. Parts of tlie flower 5, rarely 6. Calyx-lobes long-acuminate, the midrib 

 carinate. Corolla cainpanulate-fiinnelforni. Filaments filiform-subulate : anthers oblong, 

 versatile, straight or recurving in age. Style filiform, nearly persistent : stigma of 2 broad 

 oblong or oval lamella. C^apsule oval or oblong. 



-1— -t— Style short or subulate and persistent, or none : anthers remaining straight. 



++ Corolla without nectariferous pits or large glands : flowers usually 4-5-merous. 



5. GENTIANA. Calyx commonly with a membranous or spathaceous tube. Corolla 

 fuimelforni, canipanulate, or salverform (or some rotate) ; the sinuses with or without 

 plaits or appendages. Stamens inserted on the tube of the corolla. Style very short or 

 none: stigma of 2 spreading (rarely united) lamellfe, persistent. Seeds very numerous, 

 not rarely covering the whole parieties of the thin capsule. 



6. PLEUROGrYNE. Calyx deeply 4-5-parted. Corolla rotate, 4-5-parted ; the divisions 

 acute, a pair of scale-like appendages on their base. Stamens on the base of the corolla : 

 antliers introrse, versatile. Style none: stigmas decurrent down the sutures. Capsule 

 lanceolate or oblong, not stipitate. Seeds extremely numerous, near the two sutures. 



•H- ++ Corolla with one or two nectariferous pits, spots (glands), or an adnate scale to 

 each lobe : calyx 4-5-parted : seeds comparatively large. 



7. SWERTIA. Corolla rotate, 5- (rarely 4-) parted; the lobes dextrorsely convolute in the 

 bud. St\'le none, or very short : stigma 2-lamellate or 2-lobed. Capsule ovate ; the pla- 

 centce not intruded. Leaves sometimes alternate. 



8. FRASERA. Corolla rotate, 4-parted ; the lobes dextrorsely convolute in the bud, 

 bearing a single or double fringed gland, and sometimes a fimbriate crown at base. Sta- 

 mens on the very base of tlie corolla : filaments subulate, often monadelplious at base, occa- 

 sionally witii some interposed small bristles or scales. Ovary ovate, tapering into a dis- 

 tinct and often slender (but sometimes very short) persistent style: stigma small, 2-lobed 

 or nearly entire. Capsule coriaceous, commonly flattened ; the placentse or edges of the 

 valves not intruded. Seeds comparatively few, compressed, commonly smooth and mar- 

 gined. Leaves verticillate or opposite. 



9. HALENIA. Corolla canipanulate, 4-5-cleft ; the lobes sinistrorsely convolute, mostly 

 erect ; uuderneath each a hollow nectariferous spur or gibbous projection, which is gland- 

 idar at bottom (sometimes obsolete) : no fringes nor crown. Filaments slender, inserted on 

 the tube of the corolla. Ovary and capsule ovate-oblong ; the placentae more or less intro- 

 flexed : style very short or none : stigmas 2. Ovules and close-coated seeds oval or glob- 

 ular, in a single series on the margin of the valves. 



* * Lobes of the corolla imbricated in the bud, i.e. 4, two exterior and two interior : 

 no appendages : ovules and extremely numerous minute close-coated seeds covering 

 the whole parieties of the ovary and capsule : stamens inserted in or little below the 

 sinuses of the corolla: anthers ovate-sagittate: foliage hardly any or discolored. 



10. BARTONIA. Calyx deeply 4-partcd ; the sepals lanceolate-subulate, carinate. Cor- 

 olla deeply 4-cleft, somewhat canipanulate. Filaments slender, much longer than the 

 anthers. Stigma nearly sessile, of 2 erect or closed short lobes. Capsule oblong, acute, 

 2-valved. 



1 1 . OBOL ARI A. Calyx of 2 f oliaceous spatulate sepals ! Corolla oblong-campanulate, 

 4-cleft; the lobes oval-oblong or in age spatulate. Filaments not longer than the anthers. 

 Ovary rather thick-walled, and with four thicker equidistant projections, making the 

 cavity cruciform : style distinct : stigma bilamellar. Capsule membranaceous, 2-valved or 

 rupturing irregularly. 



Suborder II. MENYANTHE^E. Leaves all alternate and mostly petioled, 

 sometimes trifoliolate, or crenate. ^Estivation of the corolla induplicate-valvate. 

 Seed-coat criistaceous. Marsh or aquatic perennials : flowers heterogonons. 



12. MENYANTHES. Calyx fi-parted. Corolla somewhat funnelform or canipanulate, 

 5-cleft ; the lobes widely spreading, fimbriate-bearded or crested on the face. Stamens on 

 the tube of the corolla : anthers sagittate, versatile. Hypogynous glands 5. Ovary 

 surmounted by a long style : stignui bilamellate, 2-lobed. Capsule globular, tardily 2- 

 valved or irregularly bursting across the top. Seeds rather few and large, orbicular and 

 compressed ; the close crustaceous coat smooth and shining. Flowers on a scape. 



13. LIMNANTHEMUM. Calyx 5-parted. Corolla almost rotate and deeply 5-cleft; 

 the lobes naked on the face (but sometimes fimbriate on tlie broadly induplicate mar- 

 gins). Stamens inserted on the base of the corolla. Style short or none. Capsule ovoid 

 or oblong, indehiscent or irregularly bursting. Flowers (m ours) as if borne on a filiform 

 petiole. 



