6o6 



LOGANIACEAE. 



[VOL. II. 



i. Cynoctonum Mitreola (L,.) Britton. 

 Mitrewort. (Fig. 2849.) 



Ophiorhiza Mitreola L. Sp. PI. 150. 1753. 

 Anonymos petiolata Walt. Fl. Car. 108. 1788. 

 Cynoctonum petiolatum Gmel. Syst. a: 443. 1791. 

 Mitreola petiolata T. & G. Fl. N. A. 3: 45. 1841. 

 Cynoctonum Mitreola Britton, Mem. Torr. Club, 5: 

 258. 1894. 



Stem simple, or branched near the base, or 

 sometimes also above, glabrous, slender, erect, 

 terete, i-2 high. Leaves lanceolate or ovate, 

 petioled, i'-3' long, 3"-i' wide, acute at both 

 ends, glabrous; cymes terminal and often also in 

 the upper axils, slender-peduncled, the divisions 

 slender, simple or forked; flowers about i" broad, 

 numerous, sessile or very nearly so; capsule 

 deeply 2-lobed, compressed, the lobes at length 

 widely diverging, acute, dehiscent by a slit in the 

 ventral suture near the summit. 



In wet or moist soil, Virginia to Florida, Texas and 

 Mexico. Also in the West Indies. June-Sept. 



4. POLYPREMUM L. Sp. PI. in. 1753. 



A glabrous diffusely branched annual herb, with opposite linear- subulate leaves, their 

 bases connected by a stipular membrane, and small white flowers in terminal bractcd 

 cymes. Calyx deeply 4-parted (rarely 5-parted), the segments subulate, scarious-margined. 

 Corolla campanulate, bearded in the throat, shorter than the calyx, 4-lobcd (rarely 5 -lobed), 

 the lobes imbricated in the bud. Stamens 4 (rarely 5), inserted on the corolla, included; 

 filaments short; anthers ovoid-globose. Ovules numerous in each cavity of the ovary, on 

 oblong placentae; style short; stigma capitate or obscurely 2-lobed. Capsule globose-ovoid, 

 slightly compressed, didymous, loculicidally a-valved, the carpels at length septicidal. Seeds 

 minute, smooth. [Greek, many-stemmed.] 



A monotype, abundant in the warmer parts of America. 



i. Polypremum procumbens L,. Poly- 

 premum. (Fig. 2850.) 



Polypremum procumbens I,. Sp. PI. in. 1753. 



Stems tufted, somewhat rigid, 4-angled, spreading 

 on the ground, ascending or erect, usually much 

 branched, 2 / -i2 / long. Leaves narrowly linear, #'- 

 i^'long, #"-i" wide, acute, sessile, minutely rough- 

 toothed on the margins, often with smaller ones fas- 

 cicled in their axils; flowers solitary, sessile in the 

 forks of the cymes and along their branches, leafy- 

 bracted, the bracts similar to the upper leaves; corolla 

 \" or less long; capsule crustaceous, didymous, about 

 i" in diameter, slightly 2-lobed, the lobes obtuse. 



In dry sandy soil, New Jersey and Pennsylvania to Flor- 

 ida, Kentucky, the Indian Territory, Texas and Mexico. 

 Also in the West Indies. Occurs in cultivated fields as a 

 weed. Probably adventive in the North. May-Sept. 



Family 15. GENTIANACEAE Dumort. Anal. Fam. 20. 1829. 



GKXTIAN FAMILY. 



Bitter mostly quite glabrous herbs, with opposite (rarely verticillate) ex- 

 stipulate entire leaves, reduced to scales in Bartonia, and regular perfect flowers 

 in terminal or axillary clusters, or solitary at the ends of the stem or branches. 

 Calyx inferior, persistent, 4-1 2-lobed, -toothed or -divided (of 2 sepals in Ob- 

 olarid}, the lobes imbricated or not meeting in the bud. Corolla gamopetalous, 

 funnelform, campanulate, club-shaped or rotate, often marcescent, 4-1 2-lobed 

 or -parted, the lobes convolute or imbricated in the bud. Stamens as many as 

 the lobes of the corolla, alternate with them, inserted on the tube or throat; an- 

 thers 2-celled, longitudinally dehiscent; filaments filiform, or dilated at the base. 

 Disk none, or inconspicuous. Ovary superior in our genera, i -celled or partly 

 2-celled; ovules numerous, anatropous or amphitropous; style simple, or none; 



