1396 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Calyx lobes ciliate. 



Leaves gradually acute or acuminate 6. V. rhonxbifolium. 



Leaves abruptly acuminate or caudate-acuminate. 

 Calyx hirtellous; leaves pilose on the upper surface. 



7. V. tiliaefolium. 

 Calyx merely glandular; leaves glabrous or nearly so on the 



upper surface 8. V. caudatuiu. 



Lateral nerves of the leaves curved, inconspicuous, anastomosing before reaching 

 the margin; leaves entire or nearly so, not cordate at base, never densely 

 stellate-pubescent beneath. 

 Cymes sessile. 



Leaves broadly rounded at apex, remotely dentate or entire. 



9. V. cuneifolium. 



Leaves obtuse to acuminate, usually entire 10. V. elatum. 



Cymes pedunculate. 



Peduncles and branchlets glabrous 11. V. acutifolium. 



Peduncles and branchlets variously pubescent. 



Leaves pulverulent-tomentose beneath 12. V. sulcatum. 



Leaves glabrous beneath or with scattered stellate hairs. 



Leaves obtuselj' acuminate; branches of the inflorescence hirtellous. 



13. V. hartwegii. 

 Leaves acutely acuminate; branches of the inflorescence finely stellate- 

 pubescent. 



Calyx lobes acute; leaves entire 14. V. microphyllum. 



Calyx lobes obtuse; leaves remotely dentate 15. V. stellatum. 



1. Viburnum stenocalyx (Oerst.) Hemsl. Biol. Centr. Amer. Bot. 2: 3. 1881. 

 Oreinotinus stenocalyx Oerst. Nat. For. Kjobenhavn Vid. Medd. 1860: 285. 



1861. 



Type from somewhere in Mexico. 



Branches villous-tomentose; leaves oblong-ovate, 6 to 7.5 cm. long, acuminate, 

 obtuse at base, irregularly dentate, stellate-pubescent; cymes pedunculate; 

 calyx tube glandular. 



2. Viburnum loeseneri Graebn. Repert. Sp. Nov. Fedde 12: 244. 1913. 

 Described from Mexico, probably from Veracruz. 



Branchlets densely stellate-pilose; leaves ovate, 1.5 to 3 cm. long, acuminate, 

 rounded at base, sparsely pilose above, entire or obscurely crenate-dentate; 

 cymes dense, 6 to 15-flowered, the branches steUate-tomentose. 



3. Viburnum membranaceum (Oerst.) Hemsl. Biol. Centr. Amer. Bot. 2: 2. 



1881. 

 Oreinotinus membranaceus Oerst. Nat. For. Kjobenhavn Vid. Medd. 1860: 



284. 1861. 

 Nuevo Le6n to Hidalgo and Oaxaca; type from Cuesta de San Juan, Oaxaca. 

 Shrub, 1 to 2 meters high; leaves ovate or rounded-ovate, 3 to 5.5 cm. long, 

 acuminate, cordate at base, coarsely serrate-dentate, glabrate above; calyx tube 

 glandular or glabrate, the lobes obtuse. 



4. Viburnum microcarpum Schlecht. & Cham. Linnaea 5: 170. 1830. 

 Viburnum microcarpum evanescens Greenm. Proc. Amer. Acad. 35: 313. 1900. 

 Veracruz and Oaxaca; type from San Miguel del Soldado, Veracruz. 



Shrub or tree, 6 meters high or less; leaves rounded-ovate or suborbicular, 

 4 to 7 cm. long, obtuse or acutish, dentate, green and glabrate above; cymes 

 broad, many-flowered; calyx lobes obtuse; corolla 4 mm. broad. 



