310 CONTEIBUTIONS FROM THE NATIONAL HERBAEIUM. 



Inflorescence 5 to 13-flowered ; petals glabrous or pubescent below along 

 the costa. 

 Branchlets grayisb-strigose ; leaves more or less strigose on both sides. 



8. P. karwinskyanus. 

 Branchlets and leaves glabrous, or the leaves hairy along the veins. 



9. P. affinis. 



1. Philadelphus mearnsii W. H. Evans; Small & Rydb. N. Amer. Fl. 22: 174. 



1905. 



Known only from the type locality, on the boundary between Chihuahua and 

 New Mexico. 



Low shrub with exfoliating bark ; leaves oblong, 1 cm. long or shorter, en- 

 tire, acutish, strigose ; petals 1 cm. long. 



2. Philadelphus pumilus Rydb. N. Amer. Fl. 22: 173. 1905. 

 Baja California. California ; type from San Jacinto Mountains. 



Shrub, 1.2 to 1.8 meters high ; leaves oblong or elliptic, 6 to 10 mm. long, 

 obtuse, white-sericeous beneath. 



The species has been reported from Baja California as P. serpyllifolius A. 

 Gray. 



3. Philadelphus serpyllifolius A. Gray, PI. Wright. 1: 77. 1852. 



Northern Chihuahua and Sonora. Western Texas (type locality) and 

 southern New Mexico. 



Shrub, 1 meter high or less, with spreading branches ; leaves oblong or oval, 

 1 cm. long or shorter, entire. 



4. Philadelphus asperifolius Koern. ; Regel, Gartenflora 16: 73. 1867. 

 Known only from the type locality, Hacienda Santiaguillo. 



Shrub, 2 to 3 meters high ; leaves oval or oval-ovate, 1 to 3 cm. long, obtuse 

 or acutish. 



5. Philadelphus madrensis Hemsl. Kew Bull. Misc. Inf. 1908: 251. 1908. 

 Philadelphus palmeri Rydb. N. Amer. Fl. 22: 173. 1905. 

 Philadelphus purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 270. 1918. 

 In the mountains, Durango to Nuevo Leon and San Luis Potosi; type from 



the Sierra Madre of Durango. 



Erect shrub with slender gray or brown branches ; leaves lanceolate to oval- 

 ovate, 1 to 3 cm. long, acute or obtuse. 



6. Philadelphus mexicanus Schlecht. Linnaea 13: 418. 1839. 



Veracruz to Morelos and Oaxaca ; sometimes cultivated ; type from Jalapa, 

 Veracruz. 



Shrub, sometimes scandent to a height of 6 meters ; leaves lanceolate to 

 broadly ovate, 3 to 7 cm. long, short-petiolate, acuminate, remotely denticulate; 

 flowers shov^^y, fragrant, cream-colored, 3 to 4 cm. broad. " Jazmin," " acui- 

 lotl " (Oaxaca); "jazmin del monte," " jeringuilla " (Valley of Mexico, Cer- 

 vantes) ; "mosqueta." 



This species has been introduced into cultivation in Europe. It or one of the 

 related species is figured and described by Hernandez^ in a chapter entitled " De 

 Acuilotl, seu Volubili Aquatica." His account is as follows: "Acuilotl, or 

 water-vine, is so called by the Mexicans not without reason, for it grows in moist 

 places, and spreads over the ground or climbs over near-by trees. There are two 

 sorts, differing only in color of flowers, name, and size of leaves. The first has 

 pure white flowers and slightly smaller leaves, and is called Acuilotl; in the 

 second the flowers are pale and the leaves larger, and it is called Costicacuilotl, 



* Thesaurus 107. 1651. 



