STANDLEY TBEES AND SHEUBS OF MEXICO 1359 



9. EXANDBA Standi. Journ. Washington Acad. Sci. 13: 292. 1923. 



The genus consists of a single species. 

 1. Exandra rhodoclada Standi. Journ. Washington Acad. Sci. 13: 292. 1923. 



Type collected between La Venta and Niltepec, Oaxaca. Also in El Salvador. 



Large shrub or tree; leaves slender-petiolate, rounded-ovate or rounded-oval, 

 20 to 30 cm. long, 16 to 25 cm. wide, short-acute or acuminate, cordate at base, 

 minutely puberulent beneath upon the nerves; flowers in terminal panicled cymes, 

 mostly sessile; corolla broadly funnelform, 4 to 5 mm. long; filaments long- 

 exserted. "Brasil," "limpia-dientes" (El Salvador). 



The exact position of the genus within the family is somewhat doubtful because 

 of the lack of mature fruit. The wood turns red upon exposure to the air. 



10. ALSEIS Schott; Spreng. Syst. Veg. 4: Cur. Post. 404. 1827. 



Trees or shrubs; leaves petiolate; flowers small, white or yellow, spicate, the 

 spikes simple or branched, axillary and terminal; calyx tube obconic, the limb 

 5-lobate, the lobes deciduous; eoroUa cylindric, short, pilose within, the limb 

 5-lobate, the lobes valvate; capsule oblong-turbinate, 2-celled, septicidally 

 bivalvate; seeds linear-fusiform, appendaged at each end. 



The writer has seen a single specimen of this genus, collected at Buena Vista 

 Xbac, Yucatan, where the plant is said to be known as "cacaoche." The 

 material consists onlj' of leafless fruiting branches and consequently can not be 

 determined specifically. It may represent an undescribed species or it may be 

 Alseis blackiana Hemsl.^ which occurs in Panama and Colombia. 



11. BOUVARDIA Salisb. Parad. Lond. pi. 8S. 1808. 

 Reference: Standley, N. Amer. Fl. 32: 100-111. 1921. 



Shrubs or herbs; leaves opposite or verticillate, usually short-petiolate; flowers 

 commonly large, white, red, or yellow, cymose or cymose-corj^mbose, rarely soli- 

 tary; calyx limb 4-lobate; corolla tubular or salverform, the limb 4-lobate; 

 capsule didymous-globose, 2-celled, loculicidally bivalvate; seeds numerous, 

 compressed, winged. 



Nearly all the species are shrubby or suffrutescent, and for convenience there 

 are included the few Mexican species which are, so far as known, always 

 herbaceous. 



Leaves all or mostly in verticels of 3 to 5. Corolla red. 

 Corolla glabrous outside. 



Corolla lobes erect or ascending, 2 to 5 mm. long. 



Upper leaves sessile or nearly so, short-villous or tomentulose beneath; 



corolla lobes 2 to 3 mm. long 1. B. leiantha. 



Upper leaves petiolate, puberulent, scaberulous, or glabrate beneath; 



corolla lobes 3 to 5 mm. long 2. B. bouvardioides. 



Corolla lobes widely spreading, 5 to 8 mm. long. 



Stems and leaves villosulous or tomentulose with slender whitish hairs; 



calyx lobes 2.5 to 4.5 mm. long 3. B. viminalis. 



Stems and lower surface of the leaves villous with very coarse yellowish 



hairs; calyx lobes 8 to 12 mm. long 4. B. scabra. 



Corolla pubescent outside. 



Leaves obovate, often 5-verticillate 5. B. obovata. 



Leaves not obovate, 3 or 4-verticillate. 



Corolla tube glabrous within or sparsely villous, the hairs not collected in 



a dense ring .--6. B. glaberrima. 



Corolla tube with a densely villous ring within near the base. 



Leaves densely whitish-tomentose beneath 7. B. scabrida. 



1 Diag. PI. Mex. 30. 1879. 

 57020—26 1 



