WEATHERBY. — MEXICAN PHANEROGAMS. 425 
the perianth inconspicuous, equalling or shorter than the involucre ; 
fruit lance-ovate in outline, acute at the apex, narrowed at the base, 
with five narrow but prominent smooth ribs, the space between more or 
less strongly tuberculate, glabrous or minutely strigillose between the 
ribs.— Am. Nat. vii. 302 (1873). — Kanab, South Utah, Mrs. A. P. 
Thompson. CurHuaHvA: sand hills near Paso del Norte, Sept. 20, 
1886, Pringle, no. 1126. A specimen from Kansas, sand hills, Kearny 
Co., Aug. 29, 1897, A. S. Hitchcéck, no. 421b perhaps belongs here 
also. 
There is in the Gray Herbarium a plant clearly referable to this 
species, but differing from the typical form in its pubescent pedicels 
and involucres. It seems worthy of recognition as: var. recedens, 
n. var., a forma typica differt pedicellis involucrisque pubescentibus. — 
CuInvuAHvA: between Casas Grandes and Sabinal, altitude 1550- 
1700 m., Sept. 4-5, 1899, Nelson, no. 6351. 
In the course of a recent attempt to rearrange, with the aid of 
Mr. Standley’s excellent monograph, the Mexican specimens of 
Nyctaginaceae in the Gray Herbarium, it became apparent that, under 
the Vienna Rules, several new combinations in the genus Oxybaphus 
were required. hey are accordingly proposed here, as follows : 
Oxybaphus texensis (Coult.), n. comb. A/lionia corymbosa, vat. 
texensis Coult. Contr. U. 8. Nat. Herb. ii. 351 (1894). Adlionia texensis 
. Small, Fl. Southeast. U. 8. 406 (1903). — Coulter's no. 912, from 
Mexico, but without more definite locality, should apparently be 
referred here. 3 
Oxybaphus coahuilensis (Standley), n.comb. AJlionia coahuilen- 
sis Standley, Contr. U. S. Nat. Herb. xii. 347 (1909). 
Oxybaphus melanotrichus (Standley), n. comb. AdJionea melano- 
tricha Standley, 1. c. 351. The following, not cited by Mr. Standley, 
belongs here: CHIHUAHUA: mountains near Pilares, 23 Sept., 1891, 
C. V. Hartman, no. 743. zs 
Oxybaphus pseudaggregatus (Heimerl), n. comb. Mirabilis 
pseudaggregata Heimerl, Ann. Cons. et Jard. Genév. v. 183 (1901). 
Allionia pseudaggregata Standley, |. c. 356. — The following specimens 
belong here: San Luis Porosr: alt, 1850-2500 m., 1878, Parry & 
Palmer, no. 768 ; in montibus San Miguelito, 1876, Schaffner, no. 177. 
Vallée de Mexico, Guadelupe, ler Aofit, 1865, Bourgeau, no. 651. 
Urvillea biternata, n. sp., fruticosa 1-2 m. alta glabra vel ramulis 
minute pulverulentibus, ramis 3-5-costatis costis obtusis interdum 
tubris inter costas planiusculis vel leviter sulcatis, foliis biternatis, 
foliclis membranaceis glabris vel subtus praeter nervos sparse pu 
centibus punctis lineisque pellucidis minute punctatis ovatis subtus 
