BOREALES^FERRUGINEAE 51 



5. FERRUGINEAE. 



Leaves broad, large for the group, very obtuse, thick. Shoots neither 

 acutely angled nor much compressed. Mexican Cordillera and Western 

 Sierra Madre. 



Heavy-leaved : densely rusty-villous. P. Robinsonii. 



PHORADENDRON ROBINSONII (Urban). 



Phoradendrum Robinsonii Urban, Bot. Jarhb. vol. 23. Beiblatt 5. p. 4. 

 1897. 



Not forked, the long stout branches without cataphyls, dioecious. In- 

 ternodes rather long (3-5x40-50 mm.), at first very densely rusty-villous 

 like the foliage. Leaves broadly elliptical to oblanceolate or obovate, very 

 obtuse, 1.5-4x5-7 cm., cuneately stout-petioled for 10-15 mm. Spikes 

 often clustered, sometimes produced side by side in successive years, mod- 

 erate (20-35 mm., lengthening to 50 or even 85 mm. in fruit), villous, 

 with 5-7 rounded joints about 20-flowered when pistillate or oblong and 

 many-flowered when staminate : peduncle 3 mm. long : scales villous and 

 long-ciliate. Fruit subglobose, retrorsely long-villous or hispid, 4 mm. in 

 diameter, in approximated globose clusters 10 mm. in diameter: sepals 

 pubescent, incurved. Plates 56, 57. 



Cordillera and Western Sierra Madre of Mexico ( ? exclusively) on 

 Celtis. The type from Tehuacan. 



Specimens examined : MEXICO. Without locality (Karwiniski ; Hdhn, 

 1865-6, P. Hahnii Eichler in herb.). Tehuacan (Pringle, 6272, 1895, 

 the type, 9467, 13765; Rose & Hay, 5939; Rose, Painter & Rose, 9877; 

 Rose & Rose, 11259; Endlich, 1895; Purpus, 5832; Conzatti, 2199). To- 

 nila (Kerber, 87). Acapulco (Liebmann, 9, 3102, 1841, P. tomentosum 

 Oliver, Vidensk. Meddel. Naturh. Foren. Kjobenhavn. 1864. p. 176; 

 Hinds, 1841, slenderer and with thinner leaves, f. Hindsi. Plate 57). 



6. VELUTINAE. 



Leaves large for the group, characteristically elongated, somewhat 

 acuminately attenuate, rather thin and conspicuously nerved. Shoots 

 neither angled nor much compressed. Cordilleran region of Mexico and 

 Guatemala. 



Thin-leaved : yellow- villous. P. velutinum. 



PHORADENDRON VELUTINUM Nuttall. 



Plwrndendron velutinum Nuttall, Journ. Acad. Philadelphia, n. s. vol. 1. 

 p. 185. 1847. 



VY.sc urn velutinum de Candolle, Prodromus. vol. 4. p. 281. 1830. 



