88 



the specimens of these species in the Gray Herb., and it is clearly the same iS. 

 Coulteri. It diiTers widely from nil other Sphccralcew in habit as well as carpels. 

 The locality at which Coulter collected this species is doubtful, and it is 

 as probable he ijot it at Gruayinas as in either Californiaor Arizona, February 13 

 to 17. No. 171. 



Zizyphus obtusifolia Gray. A loose-growing, thorny shrub, generally found in 

 niewquit tliicketa; fruit black. February 15 to 17. No. 162. 



Sapindus marginatus Willd. In cultivation at Guayuias. No. 176. 



Caesalpiuia Palmeri Watson. Proo. Atner. Acad. XX1\^ 47. Dr. Palmer says: 

 Abundant plant, blooming now (February 11) with as much freedom as it 

 does in the rainy season. No. 70 of 1887 collection. No. 146. 



Coursetia glandulosa Gray, lu our remarks on tbi.s species from La Paz, p. 68, we 

 mentioned that ('. mi'cra/jAyWa should probably bereferred to this species. Acare- 

 ful examiuatioi) of a large supply of material from Guaymas convinces us that 

 the two .species are the same. C. ylandulosa was collected by Xantus from the 

 extreme point of Lower California in llower, with merely the old leaves remain 

 ing. C microphylla came from Priugle's Arizouian collection, and is somewhat 

 more advanced with the small leaves, but the older and larger ones gone. The 

 leatiets of this species are very variable, and the two forms are sometimes to 

 be found on the same specimens. In most of the specimens sent the leatiets 

 are as in C. microphtjUa, small (I to 3 lines), long sericeous pubescent, while on 

 the same plant sve find the large (7 lines long by 3 to 4 lines broad) almost glab- 

 rous leaflets of the original C. glaiidnlom : the ilowers are white, becoming rose- 

 colored. A very common shiub in gravelly arroyos about Guayuuis. It is 4 to 

 6 feet high, with several stems from the base and somewhat spreading. A very 

 profuse bloomer. February 15 to 17. It seems also to have been collected here 

 by Palmer without flowers or fruit in 1887, but not reported by Mr. Watson. 

 No. 163. 



Parkinsonia Torreyana Watson. Abont 15 feet high with large top : flowers yellow. 

 IJr. Palmer says that as the flowers open the leaves fall and the plan: remains 

 without leaves until the seeds are mature. No. 275. 



Acacia Willardiana Rose.' A slender tree, 10 to 15 feet high, with few drooping 

 branches, glabrous, and without spines of any kind : leaves with minute, de- 

 ciduous stipules; petioles phyllodia-like, 3 to 12 inches long by 1 line broad, 

 either naked or with mostly 1, sometimes 2, and rarely 4 pairs of pinna; at the 

 tip ; leaflets where present 4 to 5 pairs, sometimes 12 to 15, somewhat fleshy, 

 indistinctly 1 to2 nerved, 1 to 2^ lines long, abruptly acute, glabrousor minutely 

 pilose, as also the petioles and younger parts of the stem : the inflorescence a 

 panicleof slender spikes terminating the slender branches: spikes 2 inches long; 

 flowers yellow : calyx companulate, abont a lino long, with 5 broad obtuse 

 teeth: petals a little longer, distinct to the base, oblong to cunt^ate oblong, 

 obtu.se or abruptly acute: stamens 140 to 150. " Leguraen planum, rectum, 

 4^ l)ollicare, 5 liu. laterum." Prosopis (f) heterophtjUa Benth. Lond, Jour, Bot. 



1 While reading the proof of this paper a letter comes from Dr. Palmer, under date 

 of September 10, 1890, inclosing two mature legumes of this species, which now for 

 the first time have been collected, and may be described as follows: 



Legume glabrous, oblong to linear oblong, 2 to 4 inches long, 5 to 7 lines broad, ob- 

 tuse at tip, cuneate at base, extending into the short stipe; some constricted, others 

 not at all, membranaceous, with delicate irregular reticulations; seeds brownish, 

 oval to oblong, 4 to 5 lines long. 



The numerous filaments are still present in these mature specimens, forming a white 

 fringe surrounding the stipe, and it is a little strange that they had not been observed 

 by Benthan, who had the immature legumes. 



Only two mature legumes were found, all the others having been killed by the hot 

 winds of June. Dr. Palmer says " this was confirmed by my own observation, for an 

 entire day was spent among Acacia fVUhtrdiana and I only found two pods." 



