Nov., 1912. DIAGNOSES OF SPERMATOPHYTES GREENMAN 335 



be mentioned the following: thicker and much more conspicuously 

 tomentose stem, thicker and more coriaceous leaves which are persistent- 

 ly tomentose (not glabrous) when old, and finally slightly longer and 

 thicker pedicels and rather larger flowers. 



EUSTOMA RUSSELLIANUM G. Don in Sweet Hort.Brit.ed. 111.473 



forma leucantha Greenman, f. nov. 



Corolla albida; ceteris formas typicse simillima. Border of black 

 land prairie, Montgomery County, Texas, 18-21 July, 1909, Royal A. 

 Dixon, no. 479 (hb. Field Museum, cat. no. 248395). 



Halenia Conzattii Greenman, sp. nov. 



Herba erecta ramosissima 3-4 dm.alta foliosa glabra; caulibus ramis- 

 que teretibus vel nonnihil angularibus; foliis sessilibus lanceolatis 1.5- 

 3.5 cm. longis 0.5-1 cm. latis acutis integris trinerviis basi sensim 

 angustatis; cymis terminalibus axillaribusque; pedicellis usque ad 2 cm. 

 longis gracilibus subalato-tetrangularibus; calycis segmentis obovato- 

 spathulatis 6-8 mm. longis 2-3 mm. latis acutis vel obtusis foliaceis; 

 corollis 8-1 2 mm. longis viridibus velflavo-viridibus, corollaelobis oblongo- 

 ovatis 3-5 mm. longis breviacuminatis acutis viridibus, calcaribus 

 tenuibus pendulis rectis vel incurvis 1.5-2 mm. longis; staminibus in- 

 clusis; capsulis oblongo-lanceolatis 15-18 mm. longis subfalcatis; 

 seminibus numerosis subglobosis. MEXICO. State of Oaxaca: Cerro 

 San Felipe, Distrito del Centre, altitude 2000 m., 20 September, 1908, 

 C. Conzatti, no. 2295 (hb. Field Museum, cat. no. 239593); Sierra de 

 San Felipe, altitude 3050 m., 15 September, 1894, C. G. Pringle, no. 4908 

 (hb. Gray and hb. U. S. Nat. Museum); Cerro (Sierra) San Felipe, 

 altitude 3000-3350 m., coll. of 1894, E. W. Nelson, no. 1115 (hb. Gray). 

 This species is well-marked on account of the obovate-spatulate foli- 

 aceous calyx-segments, the green or greenish corolla, and short straight 

 or slightly incurved spurs. It is perhaps nearest allied to the little- 

 known Halesia elongata Don, but that species is said to have linear- 

 lanceolate leaves. 



IPOMCEA CONZATTII Greenm. Field Col. Mus. Bot. Ser. ii. 258 (1907). 

 Specimens of this species have been recollected at the original 

 locality, and these together with detailed notes from Professor CON- 

 ZATTI permit of the following additional characters to be recorded: 

 roots tuberiform about 5 cm. in diameter in the dried state; leaves 

 petiolate, ovate, entire or 3-lobed, obtuse to distinctly cordate at 

 the base, acute or acuminate, terminated by a mucro, dark green 

 and sparingly crisp-hirsute above, paler and subtomentose beneath; 

 petioles i to 5 cm. long, pubescent. MEXICO. State of Oaxaca: 



