STANDLEY TREES AND SHRUBS OF MEXICO. 1035 



Calyx closed in bud ; leaves usually much larger or, if small, conspic- 

 uously petiolate. 

 Lateral nerves of the leaves usually 12 or more, parallel, approximate, im- 

 pressed above; leaves mostly oblong and rounded or subcordate at 

 base, pale beneath, the pubescence minute, whitish, usually appressed. 



4. P. guajava. 



Lateral nerves few, 7 to 10, rarely 12, remote, curved, not impressed above ; 



leaves mostly elliptic or oblong-elliptic and often narrowed at base. 



never pale beneath, the pubescence spreading and often long, commonly 



brown or fulvous 5. P. molle. 



1. Psidium sartorianum (Berg) Niedenzu in Engl. & Prantl, Pfianzenfam. 3^: 



69. 1893. 



Mitranthes sartor iaiia Berg, Linnaea 29: 248. 1857. 



Tepic to Oaxaca, Veracruz, and Yucatan ; type from Mirador, Veracruz. 



Shrub or tree, sometimes 15 meters high, the bark gray, smooth ; leaves petio- 

 late, ovate or broadly ovate, acuminate or abruptly acuminate, obtuse or acute 

 at base, glabrous, the lateral nerves obsolete or nearly so ; peduncles axillary, 

 slender, 1-flowered, 1 to 1.5 cm. long; buds glabrous; fruit subglobose, 1.2 to 2 

 cm. in diameter, greenish yellow, containing several seeds. " Pichich§ " (Yuca- 

 tan, Maya) ; " arrayan " (.Jalisco, Veracruz, Oaxaca, Durango) ; " guayabillo " 

 (Guerrero, El Salvador). 



This tree is often planted for its fruit and as an ornamental tree. The 

 fruit is juicy and has a rich spicy subacid flavor. It is employed chiefly in 

 making refreshing drinks, and is used either fresh or dried. The bark is em- 

 ployed for tanning, and the leaves are reputed to have tonic and astringent 

 properties. 



This species has been mentioned in literature as Myrtus arrayan H. B. K.. 

 an error for which Sereno Watson ^ seems to have been responsible. He had 

 little gi'ound for such an identification, except the fact that the vernacular 

 name " arrayan " was applied to both species. Myrtus arrayan is a Peruvian 

 species, and Watson evidently believed that it had been introduced into Mexico 

 from South America. Some Mexican writers have been so ignorant of the sig- 

 nificance of the name arrayan that they have suggested that it might be of 

 Carib origin. It is, however, the name applied in Spain to one of the forms of 

 Myrtus communis, consequently it is not surprising to find it applied in widely 

 separated localities of America to other Myrtaceous plants. 



2. Psidium friedrichsthalianum (Berg) Niedenzu in Engl. & Prantl, Pflanzen- 



fam. 3": 69. 1893. 



Calyptropsidium friedrichsthalianum Berg, Linnaea 27: 350. 1854. 



Oaxaca. Guatemala ; cultivated in El Salvador. 



Ti*ee, 9 meters high, the branchlets quadrangular, glabrate; petioles 4 to 

 6 mm. long; leaves thin, acuminate, acute at base, lustrbus, nearly glabrous; 

 peduncles slender, 1-flowered, 3.5 cm. long or less ; buds glabrous, cuspidate ; 

 petals 5, suborbicular or oval, 8 to 14 mm. long; fruit oval or globose, yellow. 

 " Guayaba montes " (Oaxaca); "arrayan" (El Salvador), 



3. Psidium oerstedianum Berg, Linnaea 27: 360. 1854. 



Tepic to Veracruz and Chiapas. Guatemala and Costa Rica ; type from 

 Guanacaste, Costa Rica. 



Leaves oval-oblong, ovate-elliptic, or oval, acute to rounded at apex, rounded 

 at base, coriaceous, when young usually gray-tomentulose beneath but soon 

 glabrate, the lateral nerves few, not impressed above; peduncles slender, 1- 

 flowered ; buds tomentulose or glabrate ; petals 5. 



'Proc. Amer. Acad. 22: 412. 1887. 



