﻿PLANTS OF THE TRES MARIAS ISLANDS. 



79 



Collected on Maria Madre Islaud, May, 1897, by T. S, Maltby (No. 

 105) and E. W. Nelson (No. 4212); by J. N. Eose near Colomo, Siualoa, 

 July, 1897 (No. 1675). 



Wissadula hirsutifl'ora (Presl) Rose. 



The type of this species came from Acapulco. It is probably com- 

 mon on the west coast, although its distribution and specihc limits are 

 not well known. May 3 to 25 (No. 4250). 



Abutilon reventum Watsou. 



This si)ecies extends as far north as Arizona. May 3 to 25 (No. 4203). 

 Hibiscus tiliaceus L. 



A common tree in most tropical countries. Maria Magdalen a Island, 

 May 26 to 28 (No. 4328a). 



Melochia tomentosa L. 



Common throughout troi:)ical America. May 3 to 25 (No. 4205). 

 Guazuma ulmifolia Lam. 



Common throughout troi^ical America, Maria Magdalena Island, 

 May 26 to 28 (No. 4325). 



Heteropterys floribunda H. B. K. 



Common in Mexico and Central America. 



Maria Magdalena Island, May 26 to 28 (No. 4323). 



Guaiacum coulteri ? Gray. 



Seemingly common on the west coast of Mexico. Island specimens do 

 not correspond with the form found on the maiidand and may represent 

 an un described species. May 3 to 25 (No. 4180). 



Zanthoxylum insularis Rose, sp. uov. 



Tree 6 to 20 meters high, thornless; leaves oddly i)innate; leaflets / 

 6 to 7 pairs, oi^posite, sessile, obovate to spatuUite, obtuse or retuse, 

 2 to 3.5 cm. long, crenate, with large pellucid dots between the teeth 

 and small scattered dots over the surface, glabrous; flowers unknown 5 

 fruit small, in a rather compact panicle; pedicels very short; stip.e 

 short and thick. 



Collected by E. W. Nelson on Maria Madre Island. May 3 to 25, 1897 

 (No. 4278). 



Zanthoxylum nelsoni Rose, sp. nov. 



Tree 7.5 to 20 meters high, thoruless( ?) ; leaves oddly pinnate; leafV 

 lets about 6 imirs, distant, opposite, shortly petipled, 5 to 11 cm. long, 

 rounded at base, long-acuminate, crenate, glabrous on both sides, 

 thickly set with pellucid dots; inflorescence in small comj^act i:>anicles; 

 perianth complete; petals 4 (!); fruit large in dense head-like clusters, 

 not stipitate. 



A very i^eculiar species, unlike any Mexican one known to me. Col- 

 lected by E. W. Nelson on Maria Madre Island. May 3 to 25, 1897 

 (No. 4279). 



