1898.] NATURAL SCIENCES OF PHILADELPHIA. 397 



127. Stevia sp. 



Eslava pedregal, 9,000 feet, Aug. 31 (386). 



I. La Cima. Summit of Sierra del Ajusco. 



La Cima is an Indian town 38 miles from the city of Mexico 

 on the crest or summit of the Sierra del Ajusco at about 11,000 

 feet above sea level. It is, therefore, about 2,000 feet lower than 

 the Cerro Grande del Ajusco, or volcanic cone (13,612 feet). It 

 was from this extinct crater, that the great pedregal of Tlalpam 

 and many of the smaller pedregals were formed by lava flows in 

 prehistoric times. The pedregal of La Cima is lower than the town, 

 which consists of a few adobe huts. It presents the same rugged 

 features, as those of the great lava bed between San Angel and Tlal- 

 pam, which has been already fully described. Most of the plants 

 mentioned in the accompanying list are from the hill overlooking 

 and directly above the town on the east side of the railroad. The 

 soil of this hill is of a rich black character and is marked by many 

 foot paths running in every direction. 



CONIFERS. 



128. Juniperus tetragona Sehlecht in Linnaea, XII (1838) 495 ; DC. Prodr., XVI, 



ii, 491; Biol. Centr. Anier. Bot., Ill, 184. 



Reported from North Mexico in the Sierra Madre to South 

 Mexico and ascending on the peak of Orizaba to the limits of vegeta- 

 tion 12,000 to 14,000 feet. Pedregal, La Cima, Sierra del Ajusco, 

 11,000 feet, Aug. 18 (125). 



129. Pinus Montezumae Lamb. Gen. Pin. ed., I, iii, 149, t. 64; Biol. Centr. Amer. 



Bot., Ill, 1SS. 



A plant of many synonyms ; it stretches from North to South 

 Mexico, extending to timber line on Orizaba, Popocatepetl and 

 Iztaccihuatl, 10-14,000 feet. La Cima, Sierra del Ajusco, 11,000 

 feet, Aug. 18 (126). 



LILIACEJE. 



130. Stenanthium frigidura Kunth. Enum., PI. IV, 189 (1843); Biol. Centr. Amer. 



Bot., Ill, 381 ; Baker in Journ. Linn. Soc, XVII, 484. 



South Mexico, peak of Orizaba 9,000 to 12,500 feet (Linden); 

 Anganguio, 9,000 feet (Hartweg). Pedregal, La Cima, 10,000 feet, 

 Aug. 18 (132). 



131. Anthericum sp. 



Sierra del Ajusco. A plant with fascicled roots for storage of 

 food, an inch, or two long. Aug. 18 (143). 



