PLANTS OF THE THES MARIAS ISLANDS. 79 



Collected on Maria Madre Island, May, 1S97, by T. S. Maltby (No. 

 105) and E. W. Nelson (No. 4242) ; by J. N. Rose near Colomo, Sinaloa, 

 July, 1897 (No. 1675). 



Wissadula hirsutiflora (Prcsl) Roso. 



The type of this species came from Acapulco. It is ])robably com- 

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

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

 Abutiloii reveutum Watsou. 



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

 Hibiscus tiliaceus L. 



A common tree in most tropical cou'itries. Maria Magdalena Island, 

 May 26 to 28 (No. 4328a). 

 Melocliia tomeutosa L. 



Oomnion throughout tropical America. May 3 to 25 (No. 4205). 



Guazuma ulmifolia Lam. 



Common throughout tropical America. Maria Magdaleua Island, 



May 26 to 28 (No. 4325). 



Heteropterys floribunda H. B. K. 



Connnon in Mexico and Central America. 



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



Giiaiacum coulteri f Gray. 



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

 not corresjiond with the form found on the mainland and may represent 

 an undescribed species. May 3 to 25 (No. 4180). 



Zanthoxylum iiisularis Rose, sp. nov. 



Tree 6 to 20 meters high, tliornless; leaves oddly pinnate ; leaflets 

 to 7 pairs, opposite, sessile, obovate to si)atuhite, obtuse or retuse, 

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

 and snuill scattered dots over the surface, glabrous; flowers unknown; 

 fruit small, in a rather compact panicle; pedicels very short; sti])e 

 short and thick. 



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

 (No. 4278). 



Zautlioxyluni nelsoiii Rose, sp. nov. 



Tree 7.5 to 20 meters high, thornless( ?); leaves oddly pinnate; leaf- 

 lets about 6 pairs, distant, opposite, shortly petioled, 5 to 11 cm. long, 

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

 thickly set with i^ellucid dots; inflorescence in small compact panicles; 

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

 not stipitate. ' 



A very peculiar 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). 



