Part 2, 1921] RUBIACEAE 145 



glabrous, slightly paler beneath, sparsely pilose with short stiff hairs, the lateral veins promin- 



ulous, slender, divergent or ascending at angle of 50° or more, arcuate; inflorescence cymose- 



corymbose, few-flowered, the peduncles about 1 cm. long, stout, the flowers sessile; bracts 



oblong-lanceolate, obtuse or acute, 6-15 mm. long; hypanthium 3-4 mm. long, appressed- 



pilose with fulvous hairs; calyx-lobes oval or rounded-oval, 2.5-3.5 mm. long, rounded at the 



apex, reticulate-veined; corolla densely appressed-pilose. 



Type collected at Colomas, Sinaloa, 1897, /. N. Rose (U. S. Nat. Herb. wo. 866799). 

 Distribution: Sinaloa. 



4. Sommera guatemalensis Standlev, Contr. U. S. Nat. Herb. 

 17:436. 1914. 



Branches reddish-brown, sparsely lenticellate, appressed-pilose when young, soon glabrate; 

 stipules narrowly lanceolate, 3.5-4.5 cm. long, attenuate, brown, more or less strigillose- 

 sericeous; petioles 2-5 cm. long, sericeous; leaf-blades oval to oblong-obovate, 17-32 cm. long, 

 8-14 cm. wide, acute or obtuse at the base, abruptly or subabruptly acuminate at the apex, 

 with an acute acumen 1.5-2 cm. long, sericeous when young, in age sparsely appressed-pilose 

 above with minute hairs, paler beneath, appressed-pilose along the veins and sparsely and 

 minutely so elsewhere, the lateral veins prominent, subascending, arcuate ; inflorescence cymose- 

 corymbose, many-flowered, the peduncles 2-5 cm. long, the flowers sessile or short-pedicellate; 

 bracts broadly ovate or oblong, obtuse or abruptly short-acuminate, brown, sparsely appressed- 

 pilose or glabrate; hypanthium 3-4 mm. long, densely sericeous; calyx-lobes oval or broadly 

 ovate, 3-6 mm. long, usually acute or acuminate, sometimes obtuse, sparsely short-pilose, the 

 venation not reticulate; corolla densely sericeous outside, the tube 6-8 mm. long, the lobes 

 one fifth to one third as long as the tube, triangular-ovate, acute; style pilose above; fruit 

 globose-oval, 12 mm. long, 9-10 mm. wide, sparsely sericeous. 



Type locality: Near Cubilquitz, Alta Verapaz, Guatemala, altitude 350 meters. 

 Distribution: Alta Verapaz, Guatemala. 



5. Sommera grandis (Bartl.) Standley. 



Petesia grandis Bartl.; DC. Prodr. 4: 395. 1830. 



Petesia minor Griseb. Bonplandia 6: 8. 1858. 



Sommera Donnell-Smilhii Standley, Contr. U. S. Nat. Herb. 17: 436. 1914. 



Sommera mesochora Standley, Contr. U. S. Nat. Herb. 17: 437. 1914. 



Shrub or small tree, sometimes 8 meters high, the branches reddish-brown, sparsely 

 lenticellate, densely pilose when young with appressed or ascending fulvous hairs; stipules 

 lance-ovate or narrowly lanceolate, 1.5-3.5 cm. long, attenuate, brown, more or less strigose; 

 petioles stout, 0.8-2.5 cm. long, fulvous-pilose with appressed or spreading hairs; leaf-blades 

 obovate, rhombic-obovate, obovate-oval, oval, or oblanceolate-oblong, 10-22 cm. long, 3.5— 

 10 cm. wide, rounded to attenuate at the base, abruptly acuminate at the apex, bright-green 

 above, pilose, even in age, with minute appressed hairs, slightly paler beneath, sparsely or 

 densely pilose with usually appressed hairs, the lateral veins prominent, ascending or sub- 

 ascending, subarcuate; inflorescence cymose-corymbose, usually many-flowered, the peduncles 

 0.5-1.5 cm. long, the flowers subsessile or the fruiting pedicels 3-8 mm. long; bracts linear to 

 lance-ovate, acute or attenuate, pilose; hypanthium densely appressed-pilose, 3-4 mm. long; 

 calyx-lobes suborbicular to ovate-oblong, 2.5-4 mm. long, rounded or obtuse at the apex or 

 rarely acutish, reticulate-veined, appressed-pilose; corolla white, sericeous outside, 5-8 mm. 

 long, the lobes about one third as long as the tube, oblong or ovate, obtuse; fruit subglobose, 

 about 9 mm. in diameter, sparsely pilose; seeds brown, about 1.5 mm. long. 



Type locality: Mexico. 

 Distribution: Colima to Panama. 



52. TONTANEA Aubl. PI. Guian. 108. 1775. 



Coccocipsilum Lam. Encvc. 2: 56. 1786. 



Bellardia Schreb. Gen. 790 ; hyponym. 1791 ; Willd. Sp. PI. 1 : 626. 1797. Not Bellardia All. 1785. 



Condalia R. & P. Fl. Per. Prodr. 11. 1794. 



Prostrate, annual or perennial herbs, glabrous or pubescent, the branchlets terete. Leaves 

 opposite, petiolate. Stipules solitary, small. Flowers small, purplish or blue, sometimes 



