ROSE—MEXICAN AND CENTRAL AMERICAN PLANTS. 39 
True C. pulchella is still very uncertain, a multitude of forms from a wide range of 
country having been referred to it, but it must be quite distinct from the above. 
According to the description it differs both in the color and the shape of the leaflets. 
15. Cologania martia Wats. Proc. Am. Acad. 17: 345. 1882. 
Type locality: ‘Sandy places about San Luis Potosi.”’ 
Collected by J. N. Rose near Plateado, in the State of Zacatecas, September 3, 1897 
(no. 2760). 
Only collected in fruit and with fruits produced from imperfect flowers. 
14. Cologania pringlei Wats. Proc. Am. Acad. 23: 271. 1888. 
Type locality: ‘‘On pine plains at the base of the Sierra Madre, Chihuahua.’’ 
15. Cologania houghii Rose, sp. nov. 
A rather coarse trailing vine; branches densely covered with rough spreading hairs; 
leaves on very short petioles; leaflets 3, shortly oblong or nearly orbicular, 1.5 to 2.5 
em. long, rounded at apex, but often with a short mucro, becoming glabrate and 
shining above, appressed-pubescent beneath, densely ciliate; flowers usually in 
pairs, on peduncles 2 to3 cm. long; bractlets linear, attached some distance below the 
ealyx; calyx broadly tubular, 1.5 em. long; pubescent with rather scanty spreading 
hairs; lower lobe linear; lateral ones ovate, acute; upper one very broad and obtuse; 
pods not seen. 
Collected by J. N. Rose and Walter Hough along railroad between Tepeaca and 
Santa Rosa in the State and south of the city of Puebla, June 27, 1899 (no. 4737). 
Resembling somewhat C. humifusa, but with different flowers, more glabrous 
leaflets, ete. This species is named for my friend, Dr. Walter Hough, who accom- 
panied me on my second Mexican journey. 
16. Cologania lemmoni Gray, Proc. Am. Acad. 19: 74. 1855, 
Type locality: #f Arizona, on the high mesas of the Chiricahui Mountains, 188], 
and the Huachuca, 1882;’’ collected by Lemmon. 
The flowers of this species are still unknown, and only the pods produced from 
imperfect flowers have been collected. The following Mexican specimens have 
recently come to hand: 
Chihuahua: Between Colonia Garcia and Platts Ranch, below Pacheco, E. W. 
Nelson, August, 1899 (no. 6269). 
Durango: On road between San Julian and Cerro Prieto, September, 1898 (no. 
4944). 
17. Cologania humifusa Hemsl. Diag. Pl. Nov. 3: 47. 1880. 
Cologania humifusa is based upon three collections from widely different parts of 
Mexico. The first one mentioned, Parry & Palmer’s no. 194, would naturally be 
taken as the type. Unfortunately, however, this number seems to cover two species. 
The one which I would designate as the type, supposing the Kew specimen agrees 
with mine, is that with elongated pods and leaflets hairy on both sides. 
The second specimen mentioned, Coulter’s, of Real del Monte, might well be 
©. obovata from the same locality. The third specimen, from the Valley of Mexico, 
I have left in Aumifusa, although it differs somewhat in pubescence on the pods, ete. 
Type locality: ‘ Mexico: in regione San Luis Potosi, alt. 6,000-8,000 ped. . . . ; Real 
del Monte . . . ; in convalle Mexici.”’ 
Specimens examined: 
San Luis Potosi: Near San Luis Potosi, Parry & Palmer, 1878 (no. 194 in part). 
Coulter; Bourgeau (no. 330). 
Federal District: Above Santa Fé, C. G. Pringle, September, 1889 (no. 8270); 
near same locality, J. N. Rose, July 11, 1901 (no. 5358). 
Mexico: Near San Maria, J. N. Rose, July 12 and 15, 1901 (No. 5462). 
