﻿456 Wootox : New Plants from New Mexico 



mate segments small, 2-4 mm. long and half as broad, oblong- 

 elliptic, obtuse : flowers in terminal racemes : sepals oblong, ob- 

 tuse, purplish tinged without, glabrous, 1.5-2 mm. long: petals 

 elliptic, short-clawed, 2.5-3 mm. long, cream white, sometimes a 

 little purplish tinged : stamens tetradynamous, the longer of the 

 length of the petals : ovary in flowers just opening oblong-cylindric 

 as long as the stamens : stigma sessile : silique terete, 8-10 mm. 

 long, tapering at base, obtuse, glabrous, valves strongly 1 -nerved, 

 replum very thin ; seeds in two rows in each cell, elliptical, yellow ; 

 pedicels slightly shorter than the pod, ascending, the pod and ped- 

 icel in the same straight line making an angle of about 35 degrees 

 with the rachis. 



Iected at Mesilla Park, New Mexico, in April, 1897, by 



J 



This plant has no doubt been confused with various other 

 western plants which have gone as Sisymbrium cancscens Nutt., 

 though I find no material of the species in the herbarium of Co- 

 lumbia University. It is easily separated from all other related 

 species by the color of the flowers alone. From S. pinnata (Walt.) 

 Britton it may be separated by its short ascending pedicels and 

 pods and larger and more dissected leaves ; from S. Hartwegiana 

 (Fourn.) Greene by its much more dissected leaves with elliptical 

 segments and its stouter more obtuse pods. 



Prosopis velutixa. 



Spiny shrub (?) generally somewhat resembling P. glandulosa 

 Torr. : stems terete, brownish, young parts velutinous ; stipular 



loner: leaves fascicled; 



very numerous, 1—2 cm. 



petiole 1-5 cm. long ; pinnae 1-2 pairs, about half the leaves hav- 

 ing two pairs ; leaflets 12-19 P airs , elliptic-oblong, 7-10 mm. long, 

 2-4 mm. broad, obtuse, crowded, coriaceous, strongly veined, the 

 whole leaf being finely velutinous even in age ; stipules small. 

 subulate, yellow : flowers greenish-yellow, in cylindrical spikes 5- 

 10 cm. long : calyx campanulate with 5 very short teeth, abate- 

 petals 5, oblong, obtuse, very strongly ciliate within : stamens 10, 

 distinct, exserted : pistil simple : fruit a stipitate pod, linear 10- 1 J 

 cm. long, flattened and compressed between the seeds, straight 

 falcate, very velutinous when young and pubescent even in *% ' 

 indehiscent. 



Probably first collected with young fruit in the valley of N*j 

 zas in northern (?) Mexico by Gregg, May io, 1847, and labe l 

 " Bolsonde Mapimi." 



