!2 Proceedings of the Biologic(d Society of Washington. 
LenHett^ usiiallj ;>-5, rarely 0-7, commonly 2.7-5 cm. long; petioles 
one-third as long as the leaflets or .shorter. 2. C. arizonica. 
Leaflets usually 8-13, rarely 0 or 7, 1-4 cm. long; jK'tioles always 
more than half as long as the leaflets, often equaling them. 
3. C. dumosa. 
Pubescence of the pedicels consisting of slender, spreading hairs.' 
Leaflets 3-5, 2-4 mm. wide, conspicuously broadest at or above the 
middle, the margins plane or nearly so, I’epand-denticulate. 
4. C. mollis. 
Leaflets usually 7-11, rarely 5, I.:} mm. wide or narrower, of uniform 
width throughout, the margins stroiiglj? revolute, entire or nearly 
. b. C. palmeri. 
1. Choisya ternata JI. 11. K. Nov. (leu. c'c Sp. 6: (5. 1823. 
Juliania caryophillata Llave & Lev. Nov. Veg. Descr. 2: 4. 1825. 
Choisya grandijlora Regel, Gartenfl. 25 : 257. 1876. 
This is the type of the genus Choisya. In general appearance it is 
unlike C. dumosa and its allies, and there are slight differences in the 
flowers. For that reason Doctor Torrey formed a new genus, Astrophyl- 
lum, for the plant here called Choisya dumosa. Doctor Engler, in Natiir- 
lichen Pflanzenfamiflen * * maintained both genera, but iMr. Wilson t 
united them. Unfortunately the fruit of Choisya ternata is not known; 
when it is secured it may be found that the genus Astro]>hyllum is valid. 
There are only two specimens of C. ternata in the U. S. National Her¬ 
barium, one from the Cerro de ^latzize, Puebla, Mexico, and one collecte<l 
by Schiede from cultivated plants. The two exhibit many difterences in 
leaf form, but without ampler material it does not seem practicable to 
attempt a segregation. 
2. Choisya arizonica Standley, sp. nov. 
Ilranches blackish, the branchlets green, bearing numerous coar.'^e 
elevated glands, densely ]mbescent with minute, closely appressed hairs; 
petioles stout, one-flfth to one-third as long as the leaflets, minutely 
appressed-pubescent; leaflets usually 3 or 5, rarely (i or 7, linear, of 
nearly uniform width throughout, commonly 2.7-5 cm. long, 2-2.5 mm. 
wide, rounded or truncate at the apex, glabrous, or minutely appres.^^ed- 
pubescent on the upper surface, the margins slightly revolute, shallowly 
crenulate; pedicels 1.2-2 cm. long, minutely appres.«ed-puhe.scent; .sepals 
obtuse, ciliate and minutely and sparsely pubescent; petals 1 cm. long; 
style and ovary densely pubescent; fruit not known. 
Type ill the U. S. ^sational Herbarium, no. 15,060, collected on lime¬ 
stone ledges of the Santa Rita Mountains, Arizona, at an altitude of 
1350 meters, May 16, 1884, by C. G. Pringle. Alsu collected in the !\[ule 
Mountains, Arizona, July 20, 1894, by J. W. Tourney. 
This a}) pears to difler sulliciently from C. dumosa to receive specific 
* 3* : T25. 189(). 
t N. Anier. FI. 25 : 205. 1911. 
