ORDER 97. GENTIANACE^. 267 



lowest ovate ; flowers 15", the star purple, bordered with green ; petals oblong-obo- 

 vate, obtuse. Prairies, Ind. to Va., and S. If. 



9 S. gracilis Salisb. Very slender, diffuse ; leaves oblong to linear-filiform : flowers 



distant ; pet. elliptic, obtjise, 5" ; sep. filiform, 4". Wet, Mass, to Fla., and La. 2f. 

 j3. stellari*. Suberect, the flowers larger (13" broad), the star yellow. 



10 S. CAMPESTRIS. Low (610'), erect ; Ivs. ovate to oblong; fls. few, 15" broad, the 

 star yellow ; calyx tube 5-winged ; sepals as long as the broad petals. La. 



2. EUSTOMA, Don. Calyx 5- or 6-parted, with subulate segments. 

 Cor. \vheel-funnel-form, 5-6-parted. Sta. shorter than the style. Herbs 

 glaucous, with few large splendid blue flowers. 



1 E. KUSSELLIANTJM. Stem 1 2f, forked ; Ivs. ovate, cuspidate, subconnate ; fls. long- 



stalked, expanding 34', petals oval. Ark. (Mr. Robertson). 



2 E. exaltutum, taller, with flowers 2' broad, grows in S. Fla. (Chapman). 



3. ERYTHR.ZEA, Renealm. Calyx 5-4-parted, angular. Cor. funnel- 

 form, 5-4-parted, tube slender. Anth. 5-4, exserted, spirally twisted. Style 

 slender. @ Stem squarish, 3 10'. Leaves connate at base. 



1 E. ramosisslma, /3. *tluhlcnbtrg-ii (Griseb.) Stem 1-3-times-forked into a loose 



cyme ; leaves ovate-oblong ; flowers pedicellate, bright purple, 4". L. Is. to Va. : rare. 



2 E. spicata Pers. Stem forking, erect ; leaves oval to lanceolate ; fls. sessile, S", 



spicate on the long branches, rose-white. Nantucket to Md. Europe. 



3 E. Centaiirinm Pers. Erect; Ivs. oblong, acutish at each end; flowers subses- 



sile in the loosely corymbed cymes, rose-purple, 6". Oswego, N. Y. August. 



4. GENTIANA, Toum. GENTIAN. Calyx 5- or 4-parted or entire. 

 Cor. tubular, limb 5- or 4-cleft, closed or open. Sta. 5 or 4. Stig. 2, style 

 or very short. Capsule oblong, 1-celled, seeds numerous and minute. 

 Herbs with showy flowers in August to October. 



Fls. 4-partecl, fringed, sky-blue ; no crown or folds. (T) Nos. 1, 3 



Fls. 5-parted, blue, pedicellate, clustered ; no fringe or folds, (i) No. 3 



Fls. 5-parted, corolla with folded appendages between the lobes. 7f . . .(a) 



a Flower solitary, terminal, somewhat stalked. Leaves linear No. 4 



a Flowers clustered, sessile, b ochroleucous or whitish Nos. 5. 6 



b blue ; the corolla always closed No. 7 



b blue ; the corolla open or expanding. . .Nos. 8 10 



1 O. crinita Froel. Fringed G. Stem and branches erect ; leaves lanceolate, acute ; 



petals obovate, finely fringed at margin. (T) Moist soils, Can. to Ga., and W. If. A 

 beautiful and interesting plant. 



2 G. detonsa L. Stem and few branches strict ; leaves lance-linear ; flowers solitary, 



long-stalked, petals crenate-ciliate. N. Y. to Wis. If. 



3 G. quinqueflora L. St. 4-angled ; Ivs. ovate to lanceolate, acute ; fls. 7 8", pedi- 



cellate, clustered ; sepals subulate, very short, or (in /3. parriflora) lance-linear, 4" ; 

 corolla segments bristle-pointed. @ Fields and woods. If. 



4 G. angustifolia MX. Slender, erect ; fl. 1820" long ; Ivs. linear ; sepals linear, 



7 10" ; corolla blue, lobes ovate, the cleft folds much shorter. N. J. to Fla. If. 

 /3. viridifiora. Flower nearly sessile, 15", greenish white, folds very short. S. 



5 G. ocli.roleucsi Frcel. Lvs. smoothish, oval to elliptical, acutish both ends ; calyx 



segments lance-linear, nearly equalling the 20" corolla. Pa. (Prof. Porter) to Fla. If. 



6 G. alba Muhl. Very smooth, stout Ivs. lanceolate, the broad base clasping ; fls. 



2' long, calyx segments ovate, very short. Woods, prairies, M. and W. If 2f. 



7 G. Aiidrewsil Griseb. Closed Blue G. Simple, smooth: leaves oval-lanceolate; 



