GENTIANACEJE. (GENTIAN FAMILY.) 347 



SUBORDER I. Gentianeae. Leaves always simple and entire, ses- 

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



* Lobes of corolla convolute in the bud. 



i- Style filiform, usually deciduous ; anthers oblong to linear, mostly twisting or curving 



in age. 



1. Erythraea. 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. Eustoma. Parts of flower 5 or 6 ; corolla campanulate-funnel-form ; anthers versatile, 



straight or recurving; calyx-lobes long-acuminate. 



- - 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 each lobe. 



6. Haleiiia. Corolla 4 - 5-clcft, campanulate, and 4 - 5-spurred 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. Menyantheae. Leaves all alternate and mostly 

 petiu/ed, sometimes trifoliolate or crenate. ^Estivation of corolla indu- 

 plicate-valvate. Marsh or aquatic perennials. 



9. M enyanthes. Corolla bearded inside. Leaves 3-foliolate. 



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

 rounded. 



1. ERYTHEMA, Richard. CENTAURY. 



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

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

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

 branching annuals, chiefly with rose-purple or reddish flowers (whence the 

 name, from epvBpos, red] ; in summer. 



E. CfiNTAtiRiUM, Pers. (CENTAURY.) Stem upright (6-12'high),cor/m- 

 bosely branched above ; leaves oblong or elliptical, acutish, the basal rosulate, 

 the uppermost linear ; cymes clustered ', flat-topped , the flowers all nearly 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 Eu.) 



E. RAMOsfssiMA, Pers. Low (2 -6' high); stem many times forked above 

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

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

 and spiked along one side of the simple or rarely forked branches ; leaves oval 

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

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

 Nantucket, Mass., and Portsmouth, Va. (Nat. from Eu.) 



2. SABBATIA, Adans. 



Calyx 5-12-parted, the divisions slender. Corolla 5-12-parted, 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. Sab- 

 bati, an early Italian botanist.) 



