336 Field Museum of Natural History Botany, Vol. II 



procedente de Almoloyas, altitude 800 m., 15 August, 1907, C. Con- 

 zatti, no. 1959 (hb. Field Museum). The plant is known in Oaxaca 

 by the venacular name of " Jicama del Monte." 



Ipomcea dasysperma Jacq. Eclog. i. 132, /. 8g (1811-1816). 



This species was described from plants grown in the garden of the 

 University of Vienna from seeds which, it is stated, were sent from 

 England in 18 14; the seeds, it is said moreover, came originally from 

 China. The correspondence of the specimens at hand with the de- 

 scription and illustration in Jacquin's Eclogice is so strikingly coincident 

 there can be little doubt that we are dealing with one and the same 

 species. It is quite possible that there may have been some mixture 

 of the seeds grown, as it is a well known fact that Jacquin at this time 

 was growing many American plants in Vienna, and it is not unlikely that 

 he may have confused certain American importations with the seeds 

 which were supposed to have come indirectly from China. At all 

 events several complete specimens at hand agree in all essential details 

 with the above species, as it is characterized and illustrated, and the 

 writer has no hesitation in referring thereto the following Mexican 

 plants. -State of Yucatan: Merida, 20 August, 1865, A. Schott, no. 

 589 (hb. Field Museum); Izamal, coll. of 1896, Dr. Geo. F. Gaumer, no. 

 989 (hb. Field Museum); Chichankanab, Dr. Geo. F. Gaumer, nos. 1393, 

 1472 (hb. Field Museum). 



Ipomoea oaxacana Greenman, sp. nov. /. dimor pho phylla House 

 Ann. N. Y. Acad. Sci. xviii. 257 (1908), in part, not Greenman. 

 Caule volubili lignescenti glabro subtereti; ramis ramulisque juven- 

 tate pilosis glabratis; foliis petiolatis ovatis 2.7 cm. longis 1-4.5 cm - 

 latis acutis vel acuminatis mucronatis integris vel 3-lobatis basi obtusis 

 vel subcordatis supra glabris vel sparse pilosis subtus persistenter griseo- 

 tomentulosis, petiolo gracili usque ad 4 cm. longo sparse piloso; in- 

 florescentiis axillaribus subsessilibus brevi-pedunculatis 1-6 floribus; 

 pedicellis 1.5 cm. vel minus longis sursum plus minusve incrassatis 

 albo-tomentulosis ; calyce profunde 5-lobato, lobis inasqualibus ovato- 

 oblongis 5-8 mm. longis apice rotundatis vel emarginatis cuspidatisque 

 integris glabris; corolla tubulo-campanulata 6-7 mm. longa alba vel 

 in plicis rubella glabra; ovario ovideo glabro; stylo persistente basi 

 piloso. Mexico. State of Oaxaca: Cerro San Antonio, Distrito de 

 Etla, altitude 1700 m., 27 October, 1907, C. Conzatti, no. 2057 (hb. 

 Field Museum, cat. no. 225829, type); Cerro de Frujano, altitude 1800 

 m., Distrito del Centro, 15 November, 1908, C. Conzatti, no. 2313 (hb. 

 Field Museum); on talus cliffs, Sierra de San Felipe, altitude 2135 m., 



