GENTIAN ACE AE (GENTIAN FAMILY) 655 



* Corolla ^-parted, or rarely 6-7-parted. 



- Branches all opposite and stems more or less 4-angled / flowers cymose / calyx 

 with long and slender lobes. 



++ Corolla white, often turning yellowish in drying. 



1. S. paniculata (Michx.) Pursh. Stem much branched, 2-7 dm. high; 

 leaves linear or the lower oblong, obtuse, 1-nerved, nearly equaling the inter- 

 nodes ; calyx-lobes much shorter than the corolla. Low grounds, Va. to Fla. 



2. S. lanceolata (Walt.) T. & G. Stem simple, 4-9 dm. high, bearing aflat- 

 topped cyme ; leaves ovate-lanceolate or ovate, 3-nerved, the upper acute, much 

 shorter than the internodes ; calyx-lobes longer and flowers larger than in no. 1. 

 Wet pine barrens, N. J. to Fla. 



*- -M. Corolla rose-pink, rarely white, with a yellowish or greenish eye. 



3. S. brachiata Ell. Stem slightly angled, simple below, 3-6 dm. high; 

 leaves linear and linear-oblong, obtuse, or the upper acute ; branches rather 

 few-flowered, forming a panicle ; calyx-lobes nearly half shorter than the 

 corolla. (S. angustifolia Britton.) Dry or low places, Ind. and N. C. to La. 

 and Fla. 



4. S. angularis (L.) Pursh. Stem somewhat ^-wing-angled, much branched 

 above, 3-9 dm. high, many-flowered ; leaves ovate, acutish, 5-nerved, with a 

 somewhat heart-shaped clasping base ; calyx-lobes one third or half the length 

 of the corolla. Rich soil, N. Y. to Ont. and Mich., s. to Fla. and La. 



- - Branches alternate (or the lower opposite in no. 5) ; peduncles \-flowered. 

 w- Calyx-lobes foliaceous. 



5. S. calycina (Lam.) Heller. Diffusely forking, pale, 1-5 dm. high; leaves 

 oblong or lance-oblong, narrowed at base ; calyx-lobes spatulate-lanceolate, 1-2 

 cm. long, exceeding the rose-colored or almost white corolla. (S. calycosa 

 Pursh.) Sea-coast and near it, Va. to Tex. 



t-*. -M- Calyx-lobes slender and tube very short (prominently costate in no. 6, and 

 longer, nearly or quite inclosing the retuse capsule'). 



6. S. campSstris Nutt. Stem 0.5-4 dm. high, divergently branched above ; 

 leaves ovate with subcordate clasping base, 1-3 cm. long, on the branches lan- 

 ceolate ; calyx equaling the lilac corolla (3-4.5 cm. broad). Prairies, Mo. to 

 Tex. 



7. S. stellaris Pursh. Loosely branched and forking; leaves oblong to 

 lanceolate, the upper narrowly linear ; calyx-lobes awl-shaped-linear, varying 

 from half to nearly the length of the bright rose-purple corolla ; style nearly 

 2-parted. Salt marshes, Mass, to Fla. Appears to pass into the next ; corolla 

 in both at times pink or white. 



8. S. gracilis (Michx.) Salisb. Stem very slender, at length diffusely 

 branched ; branches and long peduncles filiform ; leaves linear, or the lower 

 lance-linear, the uppermost similar to the setaceous calyx-lobes, which equal the 

 rose-purple corolla; style cleft to the middle. (S. campanulata Torr.?) 

 Brackish marshes, s. e. Mass, and N. J. to Fla. and La. 



* * Corolla S-12-parted, large (3-5.5 cm. broad). 



9. S. dodecandra (L.) BSP. Stem 1-6 dm. high, loosely panicled above ; 

 peduncles slender, 1-flowered ; leaves oblong-lanceolate ; calyx-lobes linear, 

 half the length of the deep rose-colored (rarely white) corolla. (S. chloroides 

 Pursh.) Borders of brackish ponds, Mass, to N. C. 



2. CENTAtlRIUM Hill. CENTADRT 



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 

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

 branching annuals, chiefly with rose-purple or reddish flowers in summer. ( An 



