6S0.5 



F * 

 Y.a/T 



Cop. 3 



STUDIES IN THE GENUS CITHAREXYLUM. 



BY J. M. GREENMAN. 



The present paper embodies the results of a study of the material 



4 representing the genus Citharexylum in the collections of John 

 Donnell Smith, the Gray Herbarium, and the herbarium of the Field 

 Museum of Natural History. It is intended as preliminary to a 

 N synoptical revision of the group, which the writer already has well 

 under way. The generic limitations are those of Bentham & Hooker, f. 

 Genera Plantarum, ii, 1149, and of Briquet in Engler & Prantl, Die 

 natiirlichen Pflanzenfamilien, iv. Ab. 3a, 159; and the Latin form of 

 the generic name is that adopted by Linnaeus in the first edition of 

 the Species Plantarum, notwithstanding the earlier use of the Greek 

 termination. The writer desires to express his thanks to Mr. John 

 Donnell Smith for the loan of his excellent suite of specimens of this 

 genus, and to Prof. B. L. Robinson of the Gray Herbarium, where the 

 greater part of this work was done. 



Citharexylum Bourgeauianum, sp. nov. 



Tree : branches somewhat 4-angled, striate, alternately flattened 

 at the nodes; the ultimate branches evenly pubescent with short 

 spreading hairs: leaves opposite, ovate to oblong-lanceolate, including 

 the petiole 6 to 18 cm. long, 1.5 to 6 cm. broad, usually acuminate, 

 acute or obtuse, entire, glabrous above except for a slight puberulence 

 on the sunken midrib, velvety pubescent beneath, narrowed at 

 the base into a canaliculate i to 2 cm. long petiole; midrib and lateral 

 nerves rather prominent on the under surface: inflorescence terminat- 

 ing the stem and branches in elongated racemes, occasionally some- 

 what paniculately disposed, 2 dm. or less in length, hirsutish pubescent; 

 bracts subulate, i to 2 mm. long, equaling or slightly exceeding the 

 stoutish pedicels, soon recurved and more or less persistent: calyx 

 somewhat tubular or deeply cup-shaped, about 5 mm. long, crenately 

 5-lobed, hirtellous on the outer surface and slightly puberulent within: 

 corolla subsalverform, white; tube equaling ' or barely exceed- 

 ing the calyx, pubescent in the throat; lobes oblong, 3 mm. long, 

 pubescent on both surfaces: fruit riot seen. MEXICO. State of Vera 

 Cruz: region of Orizaba, Bourgeau, no. 2525 (hb. Gray) type; Orizaba, 

 Botteri, nos. 880 (hb. Gray), 1092 (hb. Gray, hb. John Donnell Smith, 

 and hb. Field Mus.). 



185 



