Bouvardia. RUBIACE.E. 23 



Series III. Stellate. Ovules (peltate and) solitary in the cells of the 

 ovary : embryo incurved, in corneous albumen : leaves verticillate without stip- 

 ules, unless the supernumerary leaves be foliaceous stipules, which may in some 

 cases be nearly demonstrated. 



26. GALIUM. Flowers 4-merous (rarely 3-raerous), 2-carpellary, sometimes dioecious. 

 Calyx-tube globular ; limb obsolete, a mere ring or obscure border. Corolla rotate ; lobes 

 valvate, and commonly acuminate or mueronate apex inflexed in the bud. Stamens with 

 short filaments and anthers. Style 2-cleft or styles 2 : stigmas capitellate. Ovary 2-celled, 

 2-lobed ; a single amphitropous ovule borne on the middle of the dissepiment in each cell. 

 Fruit didymous, dry, fleshy-coriaceous, or occasionally baccate, articulated on the pedicel, 

 tardily separating into two closed carpels, or only one maturing. Seed deeply hollowed on 

 the face : seed-coat adnate to the albumen within, and often also to the pericarp. 



1. EXOSTEMA, Rich. (Xot Exostemma, to which later authors have 

 changed the name, which is from l^w, on the outside, and o-rfjua, stamen, i. e. 

 stamens exserted.) — Tropical American shrubs or trees, one reaching Florida. — 

 Rich, in Humb. & Bonpl. PI. ^quin. i. 131, t. 38. Exostemma, DC. Prodr. 

 iv. 358 ; A. Rich. Rub. 200 ; Benth. & Hook. Gen. ii. 42. Cinchona § Exostema, 

 Pers. Syn. i. 195 (1805), where the name first appears. 



E. Caribffium, Rosm. & Schult. Shrub 6 to 12 feet high, glabrous: leaves oblong-ovate 

 to lanceolate, coriaceous : stipules subulate, small : flowers on short and simple axillary pe- 

 duncles, fragrant : calyx-teeth very short : corolla white or tinged with rose ; tube inch long 

 and lobes hardly shorter: seeds narrowly winged. — Syst. v. 18; Torr. & Gray, Fl. ii. 36. 

 Cinchona Caribosa, Jacq. Amer. t. 179 ; Lamb. Cinch, t. 4. C. Jamaiccnsis, Wright, in Phil. 

 Trans, lxvii. t. 10; Andr. Bot. Rep. t. 481. — Keys of Florida. (W. Ind., Mex.) 



2. PINCKNEYA, Michx. Georgia Bark. (Charles Ootesworth Pinck- 

 ney.) — Single species. 



P. pubens, Micnx. Tall shrub or small tree, pubescent : leaves ample, oblong-oval to 

 ovate, acute at both ends, petioled : stipules subulate, caducous : cymes terminal and from 

 upper axils, pedunculate : petaloid calyx-lobe resembling the leaves in form, pink-colored, 

 2 inches or more long : corolla inch long, cinereous-pubescent, purplish : capsule half-inch in 

 diameter. — Fl. i. 103, t. 13; Michx. f. Sylv. t. 49; Bart. Fl. Am. Sept. t. 7; Audubon, 

 Birds, t. 165 ; Torr. & Gray, Fl. ii. 37. P. pubescens, Gtertu. Fruct. iii. 80, t. 194. Pinhma 

 pubescens, Pers. Syn. i. 197. Cinchona Caroliniana, Poir. Diet. vi. 40. — Marshy banks of 

 streams in pine barrens of the low country, S. Carolina to Florida; fl. early summer. 



3. BOUVARDIA, Salisb. (Dr. Charles Bouvard.) — Low shrubs or per- 

 ennial herbs (from Texas to Central America, some cultivated for ornament) ; 

 with mostly sessile and not rarely verticillate leaves, subulate interposed stipules, 

 and handsome tubular flowers in terminal cymes. — Parad. Lond. t. 88 ; HBK. 

 Nov. Gen. & Spec. iii. t. 288; Benth. & Hook. Gen. ii. 36. — Leaves in our 

 species mostly verticillate and corolla not glabrous, its short lobes ascending or 

 barely spreading. Flowers heterogone-dimorphous in the manner of Houstonia. 



B. OVata, Gkat. Herbaceous, glabrous, obscurely scabrous : leaves mostly in fours, short- 

 petioled, ovate, one or two inches long, costately 5-veined on each side of the midrib : corolla 

 probably purple or reddish, inch long, minutely puberulent. — PI. Wright, ii. 67. — S. Ari- 

 zona, between San Pedro and Santa Cruz, Wright. 



B. triph^lla, Salisb. Suffruticose or more shrubby, scabro-puberulent, 2 to 5 feet high : 

 leaves in threes or fours (or on branchlets in pairs), from oblong-ovate to broadly lanceolate, 

 usually hispidulous-scabrous, at least the margins, 3-4-veined each side of the midrib : corolla 

 scarlet, about inch long, outside furfuraceous-pubescent. — Parad. Lond. 1. c. (broad-leaved 

 var., but not with villous-closed throat in any form); Ker, Bot. Reg. t. 107; Sims, Bot. 



