V. 



PLANT^ ■WEIGHTIAN-E. 



37 



reticulated fruit 



umbellate at the summit of tlie stem 

 gasca^ should stand the foUowin 



sharply carinate-margiDed ; and the petalifcrous flow 



are 



and the oriirinal A. urens, La- 



ts 



A 



(sp 



b 



caulibus rgracillimis decumbentibus ; foliis cordato 



oblongis obtusis longiuscule petiolatis laxe pennincrviis hirsutulis subtus pallid 

 floribus apetalis axillaribus 

 fructum subsuperantibus su 



solitariis longe pedunculatis 



petalifer 



3 



umbellatis; coccis laeviuscuUs, lateribus submarg 



bracteis 2 foliifoniiibus 

 4 ramulos graciles terminantibus 



Between Texas and El 



Paso 



Mr. Wrighfs collection of 185 



Stems numerous from 



very hirsute with Malpighiaceous hairs, from 



o 



to three feet long, difFusely de 



cumbent or procumbent. Leaves about three fourths of 

 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 lennjth, fumished with two small leaf-like subpetiolate bracts at tlie 



apex, which subtend a pedicel about as long as the flower or fr 



petalif 



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

 more foliaceous-bracteate peduncles, or axillary filiform branches. The flowcrs are 



rather larger than those 

 Petals broadly ovate, ero 

 the anex, on exserted claw 



of A. hyssopifolia, but smaller than in A. Hartwcgiana 



enulate, and minu 



glandular-fimbriate 



ds 



Filaments 5, slightly monadelphous at the base 



of them with perfect, the others with imperfect 



Gynajcium as in A. Hart 



vregiana. 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- 



the figure in 3Iem. du Mus., has larger and acute leaves, and subsessile fertile 



flower 



96. Janusia gracilis (sp 



): suffruticosa, subvolubilis ; foliis lanceolato- 



linearibus brevissime petiolatis utrinque cum caulibus gracillimis sericei 

 eulis axillaribus dichotome bifloris. — Mountains east of El Paso, Aug. 

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



pedu 



fruit 



tj 



lines wide, mostly 



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 bibracteolatc 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, Grcgg, 

 Coulter, aud 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 samaras differ- 

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



SERICEA 



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

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



eniis, Plain west of Mapimi, Gregg, — " An erect shrub,'' apparently 



Wisli 



VOL. III. AKT. 5. 



6. 



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'>M 



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