T. PLANTS WRIGHTIAN^. 37 



reticulated fruit are sharply carinate-margined ; and the petaliferous flowers are 

 umbellate at the summit of the stem. Between this and the original A. urens, La- 

 gasca, should stand the following. 



X A. LONGiPES (sp. nov.) : caulibus gracillimis decumbentibus ; foliis cordato- 

 oblongis obtusis longiuscule petiolatis laxe penninerviis hirsutulis subtus pallidis ; 

 floribus apetalis axillaribus solitariis longe pedunculatis bracteis 2 foliiformibus 

 fructum subsuperantibus suffultis, petaliferis 3-4 ramulos graciles terminantibus 

 umbellatis ; coccis Iseviusculis, lateribus submarginatis. — Between Texas and El 

 Paso; in Mr. Wright's collection of 1851. — Stems numerous from a ligneous root, 

 very hirsute with Malpighiaceous hairs, from one to three feet long, diffusely de- 

 cumbent or procumbent. Leaves about three fourths of an inch in length, ovate or 

 ovate-oblong with a cordate base, pubescent both sides, obtuse, or the lower retuse, 

 minutely mucronate ; the primary veins conspicuous underneath ; the petioles nearly 

 2 lines long. Peduncles of the apetalous fertile flowers from half an inch to more 

 than an inch in length, furnished with two small leaf-like subpetiolate bracts at the 

 apex, which subtend a pedicel about as long as the flower or fruit. The petalif- 

 erous flowers, 3 or 4 together on slender pedicels, terminate similar, but longer and 

 more foliaceous-bracteate peduncles, or axUlary filiform branches. The flowers are 

 rather larger than those of A. hyssopifolia, but smaller than in A. Hartwegiana. 

 Petals broadly ovate, erose-crenulate, and minutely glandular-flmbriate towards 

 the apex, on exserted claws. Filaments 5, slightly monadelphous at the base, three 

 of them with perfect, the others with imperfect anthers. Gyntecium as in A. Hart- 

 wegiana. Fruit of a single carpel, of nearly the same form as in A. Hartwegiana, 

 but more even, with rounded and only slightly margined sides. — A. urens, accord- 

 ing to the figure in Mem. du Mus., has larger and acute leaves, and subsessile fertile 

 flowers. 



96. Janusia gracilis (sp. nov.) : suffruticosa, subvolubilis ; foliis lanceolato- 

 linearibus brevissime petiolatis utrinque cum caulibus gracillimis sericeis ; pedun- 

 culis axillaribus dichotome bifloris. — Mountains east of El Paso, Aug. ; in fruit. 

 — Stems and branches very slender, twining or trailing. Leaves an inch long, one 

 or two lines wide, mostly acute at both ends, the margin with two or three denti- 

 form glands near the base, the two surfaces equally silky with close-pressed hairs. 

 Bracts linear, as long as the pedicels, which are minutely bibracteolate in the middle- 

 Fruit nearly as in J. Californica, Benth. I find only one or two late flowers, which 

 are quite minute, with four of the sepals bearing either one or two glands at the base ; 

 the petals short and entire ; only one or two of the five stamens antheriferous.* 



* Hiraea septentrionalis, Juss., was gathered on the northern borders of Mexico by Wislizenus, Gregg, 

 Coulter, and others. The former also brought specimens of a remarkable new species, with the inflores- 

 cence of Jussieu's second section of the genus, the floral characters of the first, and the samarse differ- 

 ing from both in the great development of the dorsal wing ; viz. : — 



HiRjEA sericea (£ngfZm. ined.) : foliis linearibus vel lineari-oblongis obtusis sessilibus utrinque sericeis 

 subtus cano-argenteis plurimis in axillis fasciculatis ; umbellis 2- 4-floris sessilibus; sepalis omnibus basi 

 grosse biglandulosis ; petalis glabris ; ovariis 2 ; samaris sequaliter late trialatis, alls distinctis. — Near Ca- 

 dena, Northern Mexico, Wislizenus. Plain west of Mapimi, Gregg. — "An erect shrub," apparently 



VOL. III. ART. 5. — 6. 



