PAM. 144 



113 



perior, 1-cclled, with numerous ovules; style mostly 1, 

 stigmas 1-2; capsule 1-or falsely 2-4 celled. 



1. Corolla-lobes imbricated; leaves reduced to scales; — slender herbs 

 with the scales opposite or alternate, and the flowers in ter- 

 minal racemes or panicles, or solitary; calyx-lobes 4-keeled; 

 corolla deeply 4-parted. white or yellowish; stamens 4, included; 

 stigma 2-lobed. Wet pine-land. - Bartonia 



B. vera*. Corolla-lobes spatulate to obovate, white. Early Spring. 



1. Corolla-lobes convolute; leaves present; — herbs with opposite or 

 whorled leaves, sessile or clasping, rarely petioled; flowers soli- 

 tary or in terminal cymes; calyx-lobes 4, corolla-lobes 4-12; 

 stamens 4-12. adnate to the rotate corolla; anthers mostly coiled; 

 ovary 1-celled with intruding placentae; styles united, stigmas 

 2. Wet pine-land. Spring and Summer., Sabbatia, American Centaury 

 a. Corolla-lobes 4-7. -_--b 



a. Corolla-lobes 8-12; — leaves linear to lanceolate; corolla rose- 



purple to white, with yellow eye, - S. dodecandra (chloroides) 



b. Branches of the stem opposite, --------c 



b. Branches of the stem alternate, --------d 



c. Stem round; calyx-lobes shorter than the tube; corolla white, 



S. macrophylla 



c. Stem 4-angled or winged; calyx-lobes linear, longer than the 

 tube; corolla white. 



Calyx-lobes longer than the tube, S. lanceolata 



Calyx-lobes about thrice as long as the tube. - - - S. paniculata 



d. Calyx-lobes foliaceous; linear to oblanceolate, usually longer 



than the corolla; — corolla rose or nearly white. S. calycina (calycosa) 



d. Calyx-lobes very narrow to filiform, usually shorter than the corolla, e 



e. Stigmas longer than the style, ___---_-f 



e. Stigmas shorter than the style, _■_---. g 



f. Calyx-lobes less than one-half of the corolla-lobes; corolla white 



or cream-color, _____-- S. Elliott ii 



f. Ca'yx-lobes nearly as long as the corolla-lobes; corolla pink or 



white, _.___ _.-_S. Stellaris 



g. Corolla lobes 1-2 cm. long, rose or magenta with yellow eye, 



S. campanulata (gracilis) 

 g. Corolla-lobes 2-3 cm. long, pink or white, sometimes striped. 



S. grandiflora (gracilis var. grandiflora) 



144. Menyanthaceae, Buckbean Family. 



Aquatic herbs with alternate or basal leaves, simple 

 or 3-foliate; flowers solitary or clustered: calyx 5-lobed; 

 corolla rotate or funnel-form; stamens 5, adnate to the 

 corolla-tube, with versatile anthers; ovary 1-celled, style 

 1, short, with 2 stigmas; fruit a capsule. 



Stems floating or creeping; leaves basal on long petioles; flower-clusters 

 on a stalk, sometimes with tubers; corolla rotate, white or yel- 

 low. - Nymphoides Limnanthemum) 

 N. aquaticum L. trachyspermum , Floating Heart. Leaves large, suborbicular to 



