250 PROCEEDINGS OF THE AMERICAN ACADEMY. 



hirsute to nearly glabrous, inconspicuously hispidulous along the an- 

 gles : leaves in fours, elliptic-oblong to subobovate, 0.5 to 1 cm. long, 

 one-half to two-thirds as broad, abruptly short-acuminate, acutish, spar- 

 ingly hirsute on both surfaces, entire, ciliate, often somewhat revolute- 

 margined, narrowed below to a subpetiolate base, 3-nerved, punctate 

 witli oblong pellucid glands : inflorescence an elongated many-headed 

 cymose panicle ; lateral branches of the inflorescence dichotomously 

 branched ; bracts small; pedicels 1 to 14 mm. long, glabrous: flowers 2 

 to 3 mm. high : calyx-limb obsolete : corolla rotate-campanulate, about 

 2 mm long, 4-dentate to the middle ; lobes ovate, acute : mature fruit 

 didymous, 1.5 mm. long, 2 mm. broad, pubescent with upwardly incurved 

 or subappressed uncinate-hispid hairs ; the two halves of the fruit often 

 separating or diverging at maturity. — Mexico. State of Hidalgo : 

 hanging from wet cliffs and banks, barranca below Trinidad Iron "Works, 

 altitude 1585 m., 6 May, 1904, C, G. Pringle, no. 8985 (hb. Gr.). The 

 pendulous habit, quaternate leaves, elongated paniculate cyme with its 

 spreading dichotomous branches, and the upwardly subappressed-hispid 

 fruit abundantly characterize this species, and enable one to readily 

 recognize it among all the other species of the genus. Its affinity is with 

 G. Pringlei, Greenm., on the one hand, and G. uncinulatum, DC, on the 

 other. 



Relbunium mazocarpum, n. sp. Stems prostrate or reclining, slen- 

 der, 2 to 30 cm. long, glabrous ; iuternodes longer or shorter than the 

 leaves : leaves in fours, ovate-elliptic to elliptic-lanceolate, 1 to 5 mm. 

 long, one-half as broad, terminated by a deciduous setiform mucro, en- 

 tire, sparingly hirsute above, glabrous beneath : inflorescence axillary : 

 peduncles slender, 4 mm. or less in length, 2-bracteate above ; bracts 

 opposite, similar to the leaves but smaller : flowers short-pedicellate : 

 calyx-limb obsolete : corolla rotate, less than 2 mm. in diameter ; lobes 

 ovate, acute, externally bearing a few stiff hairs : ovary and mature fruit 

 densely papillose-roughened, in the dried state appearing somewhat scaly. 

 — Mexico. State of Hidalgo: moist banks, barranca below Trinidad 

 Iron Works, altitude 1675 m., 6 May, 1904, C. G. Pringle, no. 8834 

 (hb. Gr.). Related to R. sphagnophilum, Greenm., and R. humile, 

 Schum., but differs from the former in being pubescent on the upper 

 leaf-surface and in having a papillose-roughened instead of glabrous and 

 smooth fruit ; from the latter species it differs in having a papillose in- 

 stead of pubescent fruit. 



Viburnum caudatum, n. sp. Shrub or small tree, 4 to 6 m. high : 

 stem and branches covered with a reddish brown cortex, subterete ; 



