Part 2, 1921] RUBIACEAE V.iU 



into 6 branches; fruit globose, about I cm. in diameter, red, tomentulose; seeds about 1 mm. 



in diameter, yellowish-red. 



TypB locality: Guiana. 



Distribution: St. Vincent; also in the Guianaa and Brazil. 



Illustrations: Miq. Stir[>. Surin. /'/. 48; Aubl. PI. Guian. pi. 123; Lam. Tab. Bncyc. pi. 259; 

 Mart. Fl. Hras. 6 6 : pi. 130. 



2. Isertia Haenkeana DC. Prodr. 4: 437. 1830. 



Isertia spicaeformis Hemsl, Biol. Centr. Am. Bot. 2: 31. 1881. Nbl I. spicaeformis DC. 1830. 

 Isertia Deamii Bartlett; Rob. & Bartl. Proc. Am. Acad. 43: 59. 1907. 

 Isertia Deamii slenophylla Donn. Smith, Bot. Gaz. 61: 374. 1916. 



Shrub, 2-3 meters high, the bark grayish, the branchlets thick, angulate, densely grayish- 

 or fulvous sericeous; stipules linear to bblong-ovate, 6-12 mm. long, acuminate or attenuate, 

 thin, glabrous or sparsely sericeous; petioles stout, 0.5-2.5 cm. long; leaf-blades obovate, oval- 

 obovate, or oblong-obovate, 19-46 cm. long, 8-18 cm. wide, usually acute to attenuate at the 

 base, abruptly long- or short-acuminate at the apex, membranaceous or chartaccous, bright- 

 green above, often lustrous, the venation plane or impressed, paler beneath, densely short- 

 pilose when young with grayish hairs, often glabrate in age, the lateral veins prominent, 

 divaricate; inflorescence cymose-paniculate, often subthyrsiform, 7-20 cm. long, pedunculate, 

 the lowest bracts often foliaceous, the others small, lance-linear; calyx and hypanthium 2.5-4 

 mm. long, puberulent or glabrous, the calyx very short, truncate or shallowly 4-6-dentate; 

 corolla 1.7-3.5 cm. long, yellow or orange-red, sparsely or densely yellow-puberulent or tomen- 

 tulose outside, sometimes glabrous, the lobes one fifth to half as long as the tube, oblong or 

 lanceolate, acute, densely barbate within; anthers 4-5 mm. long, yellow; style with usually 

 6 branches at the apex; fruit purplish, depressed-globose, 5-6 mm. broad, puberulent or glab- 

 rate; seeds brown, about 0.8 mm. long, conspicuously favose. 



Typk locality: Given, perhaps incorrectlv, as Mexico. 



Distribution: Mexico (?); Guatemala to Colombia; Cuba; reported from Guadeloupe. 



48. PLOCANIOPHYLLON Brand. Univ. Calif. Publ. Bot. 6: 



69. 1914. 



Glabrous shrubs, with terete branchlets. Leaves opposite, petiolate, membranaceous, 

 finely lineolate between the veins. Stipules intrapetiolar, minute, deltoid, erect, deciduous. 

 Inflorescence axillary, the flowers small, yellow, arranged in slender simple secund racemes, the 

 bracts minute, deciduous; hypanthium narrowly turbinate; calyx 4-lobate, the lobes triangular- 

 lanceolate, persistent; corolla salverform, the tube very short, the limb 4-lobate, the lobes 

 valvate. Stamens 4, the filaments short; anthers basifixed, linear-oblong, obtuse, erect. 

 Ovary 2-cellcd; style filiform, shallowly bilobate; ovules numerous, crowded. Fruit fleshy (?), 

 oblong-turbinate, 2-celled, chartaceous. Seeds numerous, minute, rugose. 



Type species, Plocaniophyllon flavum Brand. 



1. Plocaniophyllon flavum Brand. Univ. Calif. Publ. Bot. 6: 



69. 1914. 



Branches slender, grayish, the internodes elongate; stipules about 1 mm. long; petioles 

 slender, 3-6 mm. long; leaf-blades elliptic, elliptic-ovate, elliptic-oblong, or lance-oblong, 

 2.2-6 cm. long, 1-2.5 cm. wide, cuneate or acuminate at the base, acute to long-acuminate 

 at the apex, with an obtuse or acute acumen, thin, conspicuously lineolate, green above, the 

 venation subimpressed, paler beneath, the veins slender, prominulous, the lateral veins 5 or 

 6 on each side, arcuate-ascending, the margin plane; racemes few- or many-flowered, the 

 peduncles filiform, 2-3.5 cm. long, the rachis nodose, the pedicels 1-3 mm. long; calyx and 

 hypanthium about 2.5 mm. long, the calyx-lobes equaling the hypanthium, acute; corolla- 

 tube 2.5 mm. long, the lobes 3-4 mm. long, narrowly oblong, acute; fruit about 6 mm. long. 



Type locality: On wet rocks in a barranca near Finca Mexiquito, Chiapas. 

 Distribution: Known only from the type locality. 



