GKNTIANACt:^. (<;ENT1AN FAMILY.) 347 



Suborder I. Geutianese. Leaves always simple and entire, ses- 

 sile, never alternate. /Estivation of corolla never valvate. 



• Lobes of coroHa convolute in tin- bud. 

 •*- Style lilifonn, usually deciduous ; anthers oblong to linear, mostly twisting or cur\-ing 



in age. 

 I. Erythrsea. Parts of flower 5 or 4 : corolla salver-form ; anthers twisting spirally. 

 '2. Sabbatia. Parts of flower 5 - 12 ; corolla rotate ; anthers recurved or revolute. 



3. Eustoina. Parts of flower 5 or 6 ; corolla canipanulate-funnel-fonn ; anthers versatile, 



straight or recurving; calyx-lobes long-acuminate. 



4- -t- Style stout and persistent or none ; anthers remaining straight. 



4. Gentiana. Corolla funnel-form or bell-shaped, mostly plaited in the sinuses, without 



spurs or glands. Calyx 4 - 5-cleft. 



5. Frasera. Corolla 4-parted, rotate ; a fringed glandular spot on e.ich lobe. 



6. Haleiiia. Corolla 4-5-clcft, campanulate, and 4-5-si)urred at the base. 



♦ • Lobes of corolla imbricate in the bud; no appendages. 



7. Bartonia. Calyx 4-parted. Corolla deeply 4-cleft, somewhat campanulate. 



8. Obolaria. Calyx of 2 foliaceous sepals. Corolla 4-lobed, oblong-campanulate. 



Suborder II. Menyanthoa*. Leaves all alternate ami mostly 

 petioled, sometimes trifoliolate or crenate. ..Estivation of corolla indu- 

 plicate-valvate. Marsh or a(iuatic perennials. 



9. Menyanthes. Corolla bearded inside. Leaves 3-foliolate. 



10. Liiniianthenium. Corolla naked, or bearded on the margins only. Leaves simple, 

 rounded. 



1. ERYTHR-SIA, Richard. Centaury. 



Calyx 4-5-parted, the divisions sleiulcr. Corolla funnel-form or salver-form, 

 witli slender tube and 4 - 5-parted limb. Anthers exserted, erect, twisting spi- 

 rally. Style slender, single; stigma capitate or 2-lipped. — Low and small 

 brandling annuals, chiefly with rose-purple or reddish flowers (wlience the 

 name, from ipvQpos, red) ; in summer. 



E. CKNTAtJKirM, Pers. (Centaury.) Stem upright (6-12' high), coj-yw- 

 hoschi hninched above; leaves oblong or elliptical, acutish, the basal rosulate, 

 the uppermost linear; ci/mes cl nstereil , Jlat-topjx'd , the jioirers all tuiirli/ sessile ; 

 tube of the (purple-rose-colored) corolla not twice the length of the oval lobes. 

 — Waste grounds, shores of Lakes Ontario and Michigan. (Adv. from Ku.) 



E. KAMOSfssi.^iA, Pers. Low (2-6' high); stem uiant/ times forked idtore 

 and forming a diffuse cifme ; leaves ovate-oblong or oval, not rosulate below ; 

 fotrers all on short pedicels ; tube of the (pink-purple) corolla thrice the length 

 of the elliptical-oblong lobes. — Wet or shady places, N. J., E. Penn., and 

 southward. (Nat. from Eu.) 



E. spicXta, Pers. Stem strictly upright (6-10' high) ; the flowers sessile 

 and spiked alonfj one side ffthe simple or rarelji forked branches : leaves oval 

 and oblong, rounded at base, acutish ; tube of the (rose-colored or whitish) 

 corolla scarcely longer than the calyx, tlie lobes oblong. — Sandy sea-shore, 

 Nantucket, Ma^s., and Porti^mouth, Va. (Nat. fn>in Ku.) 



2. SABBATIA, Adans. 



Calyx 5-12-parted, the divisions slender. Corolla 5- 12-i)arted, wheel- 

 shaped. Stamens 5-12; anthers soon recurved. Style 2-cleft or -parted, 

 slender. — Biennials or annuals, with slender stems, and cymose-panicled 

 handsome (white or rose-purple) flowers, in summer. (Dedicated to L. Salt- 

 bati, an early Italian botanist.) 



