404 LEGUMINOS^. Vachellia. 



much crowded ; peduncles axillarj', solitary or geminate, longer than the 

 leaves ; flowers (yellow) in an oval or oblong head ; calyx deeply 4-toothed ; 

 petals oval, acutish, a Utile united ; stamens 10 ; legumes oblong, stipifale, 

 very oljtuse, Hat, 3-8-seeded. — Leavenworth! in Sill. jour. 7. 'p. Gl ; Hook. 

 8f Am. ! conipan. to hot. masx. 1. p. 24. A. nictitans, Nutt. ! mss. 



Prairies, Alabama, Dr. Leavenworth ! Louisiana, Drummond ! Sfc. Ark- 

 ansas, Nuttall ! Dr. LeavemcortJi, ! Texas, Drummond ! Also in Florida ? 

 — Leaves sensitive : leaflets somewhat reticulated. Legumes about half 

 an inch in breadth. 



* * Polyandrous : flowers in globose heads. 



2. A. hirta (Nutt. ! mss.) : " unarmed, herbaceous, sparsely hirsute ; pin- 

 nae 10-13 pairs ; leaflets 24-30 pairs, very small, oblong-linear, obtusish, 

 with a few scattered hairs ; petioles without glands ; stipules minute, decidu- 

 ous ; heads globose, pedunculate, geminate in the axils or somewhat pani- 

 culate at the extremity of the branches ; stamens very numerous and slen- 

 der ; legumes flat, the inargin sinuaed, by abortion few-seeded." 



Plains of the Arkansas and Red Rivers, Nuttall.' Dr. Pitcher ! Dr. Lea- 

 venworth ! On the Canadian, Dr. James .' Texan-, Drnmmond ! Dr. Lea- 

 vemvorth ! Louisiana, Dr. Hale ! May-June. — Plant 1-3 feet high, erect. 

 Stem angled, very leafy. Flowers white. Legumes membranaceous, about 

 2 inches long, linear-oblong, the margin often sinuate, and here and there 

 sometimes much constricted by the abortion of a portion of the seeds. 



3. A. Texensis : unarmed, shrubby, nearly glabrous ; pinnse 5 pairs ; 

 leaflets about 20 pairs, linear-elliptical, obtuse at both ends, 1-nerved ; pe- 

 tiole destitute of glands ; stipules minute, deciduous ; peduncles axillary, 

 longer than the rather few-flowered globose heads, 1-3 together, simple or 

 sometimes elongated, and bearing 3-4 lateral peduncles ; flowers glabrous, 

 on short pedicels ; calyx very short, truncate ; petals lanceolate-spatulate ; 

 stamens very numerous ; fruit unknown. 



Texas, Drummond ! — Resembles somewhat A. arborea, Bcnth.pl. Hart- 

 weg. (vix Willd.) ; but is glabrous, except a few scattered short hairs on the 

 rachis and margin of the leaflets, which are more obtuse, the heads of flowers 

 smaller, the stamens more numerous, &c. 



t Introduced Species. 



4. A. Julibrissin (Willd.) : unarmed, glabrous ; pinnee 8-12 pairs ; leaf- 

 lets 30 pairs, dimidiate-oblong, acute, slightly ciliate ; a depressed orbicular 

 gland at the base of the petiole ; heads pedunculate, corymbosely disposed 

 in a terminal panicle ; stamens numerous ; legimies flat, membranaceous, 

 glabrous. DC— Willd. spec. 4. p. 1065 ; DC. jjrodr. 2. p. 469. 



In gardens and yards, Louisiana, Prof. Carpenter! cultivated and some- 

 what naturalized. — A small and very ornamental tree ; a native of Persia. 

 Flowers white ; the stamens flesh-color or purplish above. The Persian 

 name is said to mean " Silky-flower." 



66. VACHELLIA. W. 8f Am. prodr. Ind. Or. I. p. 272. 



Flowers polygamous (perfect and staminate). Calyx 5-toothed. Petals 

 combined into a tubular 5-6-toothed corolla. Stamens very numerous, dis- 

 tinct. Legume cylindrical, turgid, scarcely dehiscent, filled with pulp ; the 

 seeds in a double row. — A small spreading tree, with stipular straight 

 spines. Leaves bipinnate : pLnnse 2-8 pairs, witli a gland below tlie lower 



