GENUS 10. 



GENTIAN FAMILY. 



2. Bartonia paniculata (Michx.) Robin- 

 son. Branched Bartonia. Fig. 3368. 



Centaurella paniculata Michx. Fl. Bor. Am. 1 : 98. 



1803. 



?C. Moserl Steud. & Hochst. ; Griseb. Gent. 308. 1839 

 B. paniculata Robinson, Rhodora 10 : 35. 1908. 

 B, lanceolata Small, Fl. SE. U. S. 932. 1903. 



Slender, 8'-i6' high, mostly paniculately branch- 

 ed above, the branches and scales mainly alter- 

 nate, the slender pedicels spreading or ascending. 

 Corolla yellowish-white or greenish, about twice 

 as long as the calyx, its lanceolate acute or acumi- 

 nate lobes i"-ii" long; anthers yellow. 



In wet soil, Massachusetts to Florida, Arkansas and 

 Louisiana. Aug.-Oct. 



Bartonia iodandra Robinson, of bogs in Newfound- 

 land and Nova Scotia, has larger purplish flowers 

 with broader ovate-lanceolate corolla-lobes and pur- 

 ple-brown anthers. 



3. Bartonia verna (Michx.) Muhl. White Bartonia. 

 Fig. 3369- 



Centaurella verna Michx. Fl. Bor. Am. 1 : 97. pi. 12. f. I. 1803. 

 Bartonia verna Muhl. Cat. 16. 1813. 



Stem thicker and less rigid than that of the two preceding 

 species, usually simple, 2'-is' high, racemosely or corymbosely 

 l-several-flowered. Bracts distant, appressed, some of them 

 commonly alternate ; flowers solitary at the ends of the elon- 

 gated erect peduncles, 3"-4" long; peduncles sometimes 2' 

 long; corolla white, its lobes spatulate or obovate, obtuse, 

 denticulate or entire, about 3 times the length of the calyx; 

 ovary compressed; capsule about 2,\" high. 



In moist sand, southern Virginia to Florida and Louisiana. 

 March-May. 



Family 16. MENYANTHACEAE G. Don, Card. Diet. 4: 167. 1837. 



BUCKBEAN FAMILY. 



Perennial aquatic or marsh herbs, with basal or alternate entire crenate or 

 3-foliolate leaves, and clustered regular perfect flowers. Calyx inferior, deeply 

 5-parted, persistent. Corolla funnelform to rotate, 5-lobed or 5-cleft, the lobes 

 induplicate-valvate, at least in the bud. Stamens 5, borne on the corolla, and 

 alternate with its lobes ; filaments mostly short ; anther-sacs longitudinally dehis- 

 cent; pollen-grains 3-angled. Ovary i -celled, the 2 placentae sometimes intruded; 

 style long, short or none. Fruit a capsule, or indehiscent. 



Five genera and about 35 species, widely distributed. 



Leaves 3-foliolate ; swamp plant. i. Menyanthes. 



Leaves simple, entire, cordate, floating. 2. Nymphoides. 



i. MENYANTHES [Tourn.] L. Sp. PI. 145. 1753. 



A perennial glabrous marsh herb, with creeping rootstocks, alternate long-petioled 

 3-foliolate basal leaves, and white or purplish flowers, racemose or panicled on long lateral 

 scapes or peduncles. Calyx 5-parted, the segments oblong or lanceolate. Corolla short- 

 funnelform, 5-cleft, its lobes induplicate-valvate, fimbriate or bearded within, spreading. 

 Stamens 5, inserted on the tube of the corolla; filaments filiform; anthers sagittate. Disk 

 of 5 hypogynous glands. Ovary i-celled ; style subulate, persistent ; stigma 2-lamellate. Cap- 

 sule oval, indehiscent or finally rupturing. Seeds compressed-globose, shining. [Greek, per- 

 haps month-flower, name used by Theophrastus.] 



A monotypic genus of the cooler parts of the northern hemisphere. 



