40 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
18. Cologania obovata Schlecht. Linnea 12: 287. 1838. 
This species was collected by C. Ehrenberg at ‘‘ Mineral del Monte,’’ perhaps bet- 
ter ‘‘Real del Monte.” 
Mr. Hemsley thinks this must be a variety of C. pulchella, but it is described as 
procumbent. I have seen no specimens. 
. This species should be compared with CL humifusa Hemsl. 
19. Cologania humilis Rose, sp. nov. 
Delicate herbs, somewhat branching at base, nearly erect, 8 to 12 em. high, 
retrorsely pubescent; petioles 2 to 3.5 cm. long, usually longer than the leaflets; 
leaflets 3, elliptical to linear-oblong, obtuse or acute, appressed-pubescent on both 
sides, paler below, more or less articulated; calyx tube 6 mm. long, appressed- 
pubescent; corolla violet, 2. em. long; pods not seen. 
Collected by J. N. Rose, high up on the Sierra Madre, near Santa Gertrudis, 
August 7, 1897 (nos. 2042, type, and 3426). 
20. Cologania nelsoni Rose, sp. nov. 
A climbing vine, 9 to 24 dim. long, with scattered appressed pubescence; leaflets 3, 
elliptical, acute, 2.5 to 5 em. long, above somewhat shining and strongly reticulated, 
beneath pale and reticulated, with scattered appressed hairs on both surfaces; racemes 
axillary, elongated, longer than the petioles, bearing 3 to 5 pairs of flowers; pedicels 
8mm. long; bractlets at base of flower short, minute; calyx tube 8 to 10 mm. long, 
bearing scattered appressed hairs; lower lobe lanceolate, acuminate; lateral lobes 
broadly ovate, acute; upper lobe obtuse; corolla pale violet, 2.5 to 2.8 em. long; fruit 
not seen. 
Collected by E. W. Nelson in mountains about Yalalag, Oaxaca, altitude 1,800 
meters, August 1, 1894 (no. 976). 
This species differs from C. racemosa in the thickness, venation, and shape of 
leaflets, the shape of the calyx lobes, larger flowers, ete. 
21. Cologania racemosa (Robinson) Rose. 
C. pulchella racemosa Robinson, Proc. Am. Acad. 29; 315. 1894. 
A climbing vine with pubescence dense and reflexed, but not closely appressed; leaf- 
lets 3, broadly ovate, 2 to5 em, long, 1.5 to4em. broad, generally acute, but sometimes 
obtuse or even retuse, pubescent on both surfaces, not strongly reticulated above, 
green, paler beneath and somewhat reticulated; imperfect flowers (fertile) in pairs in 
the lower axils, nearly sessile; pods linear, flat, 3 em. long; perfect flowers numer- 
ous, borne in elongated racemes 10 to 15em. long; buds acuminate; calyx, 5 to6 mm. 
long; lobes narrow; corolla dark purple, 18 to 20 mm. long; fruit not seen. 
Type locality: The variety was based upon two collections, Dr. E. Palmer’s no. 
379 © Tequila,’ and Mr. Pringle’s no. 5164 “Guadalajara.” 
Specimens evamined: 
Jalisco: Only Palmer’s and Pringle’s plants referred to in original description, 
of which duplicates are in the National Herbarium. 
This form seems specifically distinct from CL pulchella. It differs in haying its 
perfect flowers borne in elongated axillary racemes, in the size of the leaves, in the 
pubescence of the calyx, ete. 
22, Cologania biloba ( Lindl.) Nicholson, Dict. Gard. 1:363. 1884-1889. 
Glycine biloba Lindl. Bot. Reg. 17: pl. 1478. 1831. 
This species was described from specimens which flowered in England in 1830. 
The seed is said to have been brought from Mexieo by Mr. George Ackermann in 
1827. 
We have no named specimens of this species. Pringle’s no. 6432, from the Pedre- 
gal, near the City of Mexico, must be near it. Bourgeau’s no. 774, also from the 
Pedregal, belongs with Mr. Pringle’s plant. The latter was referred by Mr. Hems- 
ley to C. pulchella. 
