60 PLANTS WRIGHTIAN^. V. 



155. Algarobia glandulosa, Torr. 8f Gray, Fl. 1. p. 399. Plains of Western 

 Texas. " A tree, from 20 to 30 feet high ; the trunk 12 or 18 inches in diameter." — 

 In foliage at least our plant seems unlike Prosopis dulcis ; but quite like P. sili- 

 quastrum (or P. juliflora), which is thought to be a mere variety of P. dulcis. 

 The structure of the pod is the same in all three, and all may be varieties of 

 one widely distributed and polymorphous species, for which the name of juliflora 

 should be adopted. What I had once examined as an Algaroho pod (PI. Lindh. p. 

 35) was doubtless the legume of a Ceratonia. P. Limensis has the seeds inclosed 

 in separate coriaceous investments, as in P. juliflora ; so has P. fruticosa. It is the 

 same in P. sericantha and P. humilis, only the pips are quadrate from mutual pres- 

 sure. In the former they are very thick and cartilaginous : and the pod in both is 

 liable to break up transversely into one-seeded articles. In P. torquata the seeds 

 are inclosed in similar, well-defined pips : so also in P. abbreviata, except that they 

 are thin, pointed at both ends, and elongated, so as to become spirally twisted with 

 the pod. These torquate species are therefore inseparable from Algarobia, except 

 as a mere section, while P. strombulifera, P. reptans, and the following species, 

 having continuous, even, and closely spiral legumes, are true Strombocarpse. 



156. Strombocabpa pubescens. S. brevifolia, Niitt. in Herb. Hook. Prosopis 

 (Strombocarpa) pubescens, Benth. in Land. Jour. Bat. 5. p. 82. — High pebbly prai- 

 ries west of Zacate Creek, July ; in flower. Valley of the Eio Grande 40 or 50 

 miles below El Paso, Sept. ; in fruit. Also gathered, in flower, in the collection of 

 1851. North of the Jornada del Muerto, N. Mexico, Dr. Wislizenus. — Shrub 

 6-12 feet high; the erect spikes an inch or an inch and a half long, on rather 

 long peduncles ; the rhachis nearly glabrous, but the flowers silky-pubescent, and 

 the ovary very villous. The closely spiral cylindrical pods are from one to two 

 inches long, and cinereous-pubescent when young. — The specific name of pubescens 

 is not well chosen, as the leaflets scarcely appear pubescent to the naked eye. But 

 it may prove to be only a small-leaved variety of Dr. Torrey's earlier-published 

 Prosopis odorata. The oblong leaflets, however, are barely half as long, about 

 three lines, and the pinnae only an inch long.* 



persistentibus ; foliolis 3 - 4-jugis elliptico-oblongis glabellls nitidis coriaceis eximie reticulatis (3-4 lin. 

 longis) ; glandula petiolari turbinata ; pedunculo axillari vel supra-axillari pluribracteato 1-2-floris folio 

 aequilongis ; sepalis membranaceis (aurantiacis) obtusis glabellis petalis obovatis aureis dimidio breviori- 

 bus ; legumine ignoto. — Northern Mexico, near Rinconada, Cerralvo, and Monterey, Dr. Gregg; North 

 of Monterey, Dr. Wislizenus. — A shrub, one or two feet high, with small leaves, and proportionally 

 large, deep-yellow flowers. 



C. (Cham^fistula?) Wislizeni (sp. nov.) : fruticosa, subglabra; foliis plerumque fasciculatis ; foliolis 

 bijugis obovatis retusis mucronatis recte-venosis (3 lin. longis) ; petiolo eglanduloso in appendicem seta- 

 ceam producto ; stipulis subulato-setaceis ; pedunculis 3- 5-floris ad apicem ramorum confertis corymboso- 

 paniculatis ; sepalis late oval ibus obtusissimis margine subscariosis undulatis petalis (flavis) obovato-rotun- 

 dis ter quaterve brevioribus ; legumine ignoto. — Carizal and Ojo Caliente, south of El Paso, Dr. Wisli- 

 zenus ; Aug. — Shrub 4 to 6 feet high ; the branches puberulent, very leafy to the top, and bearing a 

 corymb or panicle of copious and large flowers ; the petals al most an inch long. 



* Berlandier's No. 2013, mentioned under Prosopis reptans, in Hook. Jour. Bat. 4. p. 352, was raost 

 probably gathered in Northern Mexico, not in Texas. It is doubtless the same as No. 492 of Gregg's 

 Mexican collection, which, I think, may be characterized as follows : — 



