340 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
+. Allionia gracillima Standley, sp. nov. 
Stems 20 to 50 cm. long, from a slender woody root, very slender, much 
branched, dichotomous, frequently 4 branches from a single node, the branches 
rather densely interlacing, the plant erect or decumbent, the stems glabrous 
throughout, more or less glaucous, especially near the nodes; leaf blades thin, 
linear, acute, bright green, sessile, 10 cm. or less in length; involucres single 
in the axils of the leaves on filiform pedicels, which are G mm. or less. in 
length, the pedicels glabrous or with a few minute, appressed hairs; flowers 
apparently all cleistogamous; involucres cleft almost. to the base, the lobes 
narrowly elliptical, acutish, finely pubescent, about 4 mm. high; fruit 5.5 mi. 
or less in length, acutish above, slightly narrowed below with 5 very prominent 
and thick, obtuse ribs, finely hispidulous, 
I first saw this plant in the herbarium of the University of Arizona, but 
hesitated to describe it, thinking it merely an abnormal form. Later, on ex- 
amination of the excellent series of specimens of the plant collected by Mr. 
Blumer, it could be seen that the plant was distinct from its nearest ally, 
A. coccinea, From that species it differs in its more slender and much branched 
stem, less erect habit, cleistogamous flowers, and the usually single fruit in the 
involucre; the method of inflorescence, too, is very different. 
Type in the herbarium of the New Mexico Agricultural College, collected in 
the Chiracahua Mountains, Arizona, 1907, /. C0. Blumer 1769, near Paradise, 
at an altitude of 1540 to 1880 meters. Also collected at Oracle, Arizona, 1905, 
Thornber, 
2a. Allionia gracillima filifolia Standley, subsp. noy. 
This differs from the species in having smaller and thicker filiform leaves. 
It also appears to be a smaller plant. The leaves of the species, although 
harrow, are not filiform but flat. . 
Type in the herbarium of the New Mexico Agricultural College, collected nt 
Mangas Springs, New Mexico, August 17, 1902, Wooton. 
2b. Allionia gracillima scabridata (Heimer!) Standley. 
Mirabilis coccinea scabridata Heimerl, Aun. Cons. et Jard. Geney. 5: 186. 
1901. 
In the herbarium of the University of Arizona there is a specimen collected 
in the Santa Rita Mountains, Arizona, 1903, Thornber 252, that answers well 
to the description of Doctor Heimerl’s variety, in having its stem and leaves 
covered with a fine appressed pubescence almost throughout. The type was 
collected in the Santa Rita Mountains by Pringle. If this plant is the same 
as the type, and I have little doubt that it is, it is more closely related to A, 
gracillima than to A, coccinea, differing from the former chiefly in its pubes- 
cence and rather wider leaves. 
3. Allionia petrophila Standley, sp. nov. 
Perennial from a thick root, 50 to 60 em. high; branches erect, strict: stems 
sparingly branched, very slender, glabrous except the branches of the in- 
florescence, which are finely and sparingly puberulent, pale or glaucous: leaf 
blades linear, 75 mm. long or less, of medium texture, glabrous, acutish, ses- 
sile; inflorescence dichotomously cymose, the cymes narrow, few-flowered ; 
involucres on pedicels about 5 mm. long and densely soft-pubescent ; involucres 
about 10 mm. in diameter, the lobes broadly ovate, obtuse, densely  soft- 
pubescent, the lobes as long as the tube or shorter; fruit brown, 4 mm. long, 
‘ather obtuse above or acutish, narrowed below, with 5 very thick, tuberculate 
ribs, the narrow spaces between the ribs tuberculate, glabrous. 
