99 



Mimosa (Leptostachyae) Palmeri, n. sp. Large, bushy ahnib, 8 to 10 feet high, 

 thornleas or with a few infra-stipuhir spines; the younger branches fuacous- 

 pubescent: loaves largo, with setuceotia stipules; rhachis 4 to 8 inches long, 

 deeply grooved; pinnae with small stipels, 6 to 10 pains, oblong-obliqne 1^ to 2^ 

 lines long, appressed pnbesccut above and below : spikes (2 to 4 inches long) 

 axillary or racemose, corolla pinkish, its lobes pubescent and spreading : stamens 



10 : ovary with reddish-brown pubescence, tipped with a long, slender style. 



This shrub was only found in (lower, and these mostly in terminal racemes 6 to 8 

 inches long. The buds and llowers are pink and very showy and sweet-scented. 

 Near Alamos. September Ifi to HO. No. G'28. This plant comes nearest to M. 

 Wrightii, but with larger and more open leaves and with difl'erent pubescence. 



Acacia pennatula Benth. In these specimens the peduncles are very short (3 to 

 6 lines long), while tliose of Pringle from Jalisco (1889), referred here by Mr. 

 Watson, have peduncles sometimes 1^ inches long. No fruit accompanies these 

 specimens. Commonly called "Algaroba." It is a small tree with a very broad 

 top. The flowers are very numerous, orange-colored, and very fraiTant. 



Acacia malacophylla Bentli. var. microphylla Watson. Our plant seems to be the 

 same as Pringle's Sonoran specimens collected in 1884. We have not seen Mr. 

 Watson's description of this variety. Dr. Palmer says it is a small tree resem- 

 bling the mesqnit. It is nearly exterminated ; about settlements it is much used 

 for fuel. Near Alamos. March 2C to April 8. No. 315. 



Acacia (?) sp. A large bnshy slirub with several stems, 8 to 10 feet high, with a 

 large top, somewhat thorny : pinnai 4 to 8 pairs ; leaflets 8 to 10 pairs, oblong 2 

 to 3 lines long : heads on peduncles i inch long : pods with 6 to 10 deep constric- 

 tions, margin thick and breaking away from the valves. Alamos, September 16 

 to 30, No. 627. This shrub is probably of this genus, but as it is only in fruit 

 its generic position is doubtful. The pods seem to ally it with A. consfr'wia. 



Leucaena lanceolata Watson., Proc. Amer. Acad. xxi. 427. A large bushy shrub 8 

 to 10 feet high, glabrous or nearly so throughout : pinnte 4 to (i pairs with a small 

 gland between or at the base of the upper pair ; leaflets 3 to 6, glabrate or nearly 

 so : pods erect, 6 inches long tapering at base into a stipe (6 to 8 lines Ion"-) gla- 

 brous, marked with cross partitions. L. lanceolata was described from floweriu"- 

 specimens and ours is in fruit. It seems nearest that species but differs from tfie 

 description in most of the above particulars and lacks the large <Hand on the 

 petioles. In a canon near Alamos. September 16 to 30. No. 718. 



Lysiloma Watsoni, n. sp. A small tree 10 feet high, 3 inches in diameter; branches 

 rhachis and leaflets densely cinereous-pubescent: leaves large; rhachis 5 to 6 

 inches long ; pinniB 8, 2 to 5 inches long ; leaflets 30 to 45, thick, oblong, 2 to 4 

 lines long, obtuse, with midrib somewhat excentric : legumes single or two or 

 three in a cluster, oblong, 5 to 8 inches long, 10 to 12 lines broad, tapering at 

 base into a stipe, 6 to 12 lines long and abruptly narrowing into a spiny tip 6 

 lines long ; the exocarp first breaks away from the persistent maro-in : seeds ob- 

 long-ov.al, 4| lines long, brownish with a darker elliptical mark on each side. Ala- 

 mos. September lGto30. No, 664.— Dr. Palmer says this tree has a symmetrical 

 top. It was only seen in fruit. With this species I am inclined to refer Palmer's No, 

 88 (1886) from Barancaof the State of Jalisco referred to "Lysiloma (T) sp," by Mr. 

 Watson in I*roc. Amer. Acad. xxii. 410. Palmer's No. 88 is simply iu flower and 

 the leaflets, immature, are smaller and described as glabrous. Even in frnitin"- 

 specimens there is considerable diff"erence in the size of the leaflets. The pubes- 

 cence is developed by age. No, 88, which appears to be glabrous even under 

 an ordinary lens, shows under the high power the nascent pubescence. The 

 stipules are wanting in my specimens, and the tips of the leaflets are a little dif- 

 ferent from Mr. Watson's specimen but in other respects it seems to be the same. 

 This well-marked new sriecies belongs to Mr. Bentham's second section of this 

 genus. It may well bear the name of Mr. Watson, who has characterized but 

 not named the species. 



