30 PLANTS WRIGHTIAN^. V. 



Calcareous hills of the San Felipe River ; July. It was likewise gathered by Ber- 

 landier, in the southern part of Texas. — To this solitary representative of the prop- 

 er Rue Family in America hitherto known, the subjoined species of Peganum, from 

 Dr. Gregg's collection, is to be added.* 



t KoEBERLiNiA sPiNosA, Zucc. PI. Hovt. 8f Hcrb. Monac. fasc. 1. p. 359 (in 

 Denkschrift. Miinchn. 1832) ; Benth. PI. Hartw. p. 35. Along the Rio Grande, 

 Texas. Also on the Mexican side of the river, at Bolson de Mapimi, &c., Dr. 

 Gregg. — " A much-branched, leafless shrub, consisting of nothing but thorns, flow- 

 ering in July and August. Flowers greenish-white. Berries oval." Wright. In 

 Dr. Gregg's collection we have young fruit, and from Dr. Torrey I now have ripe 

 fruit, gathered on our Southern frontiers by the U. S. Boundary Commission ; which 

 shows that the genus does not belong to Pittosporacese, where it was referred by 

 Zuccarini, but tends to confirm the view suggested by Bentham, of its afiinity 

 with the American Diosmese. I append the characters.! The stamens are not of 

 sensibly unequal length, nor are the anthers attached by the base, as stated by 

 Bentham; nor do I find the style incurved or uncinate at the apex, at least until 

 after flowering. The ovules are straight and anatropous ; but the seeds, which are 

 few, and large for the size of the fruit, are strongly circinate or cochleate. 



ZANTHOXYLACE^. 



81. Zanthoxylum Carolinianum, Lam.; Torr. 8c Gray, Fl. 1. p. 214: var. fru- 

 ticosum ; foliolis brevioribus ovatis oblongisve vix aut ne vix acuminatis magis cre- 



* Peganum Mextcanum (sp. nov.) : eaule humili pubescente ; foliis multipartitis, laciniis anguste line- 

 aribus ; calyce 4-sepalo corollam 4-petalara duplo superante ; sepalis 3 - 5-partitis foliiformibus, laciniis 

 subsequalibus ; stamiiiibus 12-13. — Saltillo and Monterey, Nordiern Mexico, abundant. Dr. Crregg. — 

 Stems 8 or 9 inches high, very leafy. Peduncles axillary, shorter than the flower. Corolla pale yellow. 

 Disli scarcely cupulseform. Style slender; the three-lobed stigma shorter than that of P. Harmala. 

 Filaments scarcely dilated at the base. Except in this last respect, and in the (perhaps not uniformly) 

 quaternaiy calyx and corolla, our plant wholly accords with the characters of Peganum. It is remarka- 

 ble for the great length of the calyx, the divisions of which resemble those of the leaves. The plant is 

 evidently well known to the Mexicans, who, according to Dr. Gregg, call it Garbanzilla, Romero del 

 Campo, or Limoncillo, and use a decoction of it for gonorrhoea. It is said to be poisonous to cattle. 



t KOEBERLINIA, Zucc. 



Calyx tetrasepalus, parvus, liber ; sepalis subcoloratis, obtusis, sestivatione imbricatis, deciduis. Petala 4, 

 hypogyna, calyce 3-4-plo longiora, obovato-oblonga, subunguiculata, aestivatione convoluto-imbricata, de- 

 cidua. Discus nullus. Stamina 8, hypogyna, libera, petalis subsequilonga : filamenta medio incrassata, 

 utrinque subulato-attenuata : antheras ovales, dorso supra basim insertse, introrsee, biloculares, loculis lon- 

 gitudinaliter dehiscentibus. Ovarium ovoideum biloculare, basi in stipitem brevem, apice in stylum simpli- 

 cem subulatum, attenuatum : stigma terminale, obtusura, minutissime emarginatum. Ovula plurima, in 

 placentis crassiusculis medio dissepimento utrinque adnatis multiseriata, horizontalia vel dependentia, ana- 

 tropa. Bacca subglobosa, parvula, stylo persistente apiculata, bilocularis, sarcocarpio tenui ; loculis abortu 

 1-2-spermis. Semina verticalia, circinato-cochleata : testa Crustacea, levissime ruguloso-striata : albu- 

 men tenuissimum sen vix uUum. Embryo annularis, endopleurum tumidum replens ; cotyledonibus semite- 

 retibus ; radicula adscendente. — Frutex aphyllus, ramosissimus, glaber ; rarais viridibus rigidis ; ramulis 

 teretibus omnibus in spinas validas desinentibus ; squamulis ad foUa respondentibus alternis, minimis, cadu- 

 cis ; floribus parvulis in racemis brevibus umbelliformibus sub apice ramulorum lateralibus, albidis. 



