306 



XL. LEGUMINOS^. [Jcacia. 



Nerves of the pliyllodia few aud pronilueiit, usually 3. j • j 



Sepal= narrow-spathulate, free (Western species) .... 51. ^. iripfijclia. 



Sepals united (Eastern species) ,......._ 11%, A, elonyata. 



Nerves of the phyllodia numerous, very Hue, often only visible 



under a lens. 



Phyllodia slender, terete, scarcely hooked. Sepals narrow- 

 spat hulate, nearly free. Pod unknown CVVeslern species) 52. ^. lejptoneura. 



Phyllodia thick, slightly flattened, hooked. Flowers un- 

 known. Podhroad, flat, membranous (Southern species) 54. A. pnpijrocarpa, 



Phjllodia terete, rigid, scarcely hooked. Sepals spathulate, 

 united to the middle. Pod very narrow, twisted, convex, 



coriaceous (Eastern species) 53. ^. ngens. 



(185, A. lineolaia, has sometimes nearly the phyllodia of A, leptoneura, but decidedly 

 flattened and often much broader,) 



C. XJninerves. — Phyllodia \-nerved or ner'veless. 



Phyllodia mostly elongated, above \\ in. long. 



Peduncles 1-headed. Flowers 1 to 4 in the head, 4-mcrou3. 



Petals striate . ^ . . . ^^, A. tetragonocarpa. 



Peduncles 1-headed. Sepals spathulate (Eastern species). 



Phyllodia 1^ to 2 or rarely 3 in. long; nerve pr{?ininent. ../.-, 



Petals with a prominent midrib . l^^. A , v^tgiomformi^ 



Phyllodia 3 to 6 in. long, obscurely nerved. Petals without ^ 



any prominent nerve . . , h^. A.jimcifoha. 



Peduncles mostly bearing a raceme of 2 or 3 heads. Calyx 



shortly toothed or lohed (Eastern species) ^. A. calamvfolia. 



Peduncles 1-headed or rarely irregularly racemose. Calyx trun- 

 cate (Western species). • v ;■ 



Phyllodia terete, obscurely nerved h%. A. scirpijow. 



Phvllodia. prominently nerved. Branches acutely angular, 



almost winged . 59- ^- ^•^^^^^^' 



Phyllodia short, rarely exceeding 1 in. 



Phvllodia very riojid, tetraffonous, with very prominent nerves, 1 



in. loug or rather more . . . . . . . . . . . . (.Q. AfgonophyUa. 



Phyllodia mostly under 1 in., terete or slightly flattened hori- 

 zontally, usually nerveless, and often pctiolate. 

 Branches not thorny. 



Phyllodia mostly ^ to f in., narrowed but not petiolate. . 



Peduncles Blender . . ^\- A. encifoha, ^ 



Phyllodia mostly 1 in. lonj^, distinctly peti(date. Peduncles . , 



short . . . . ... . . . . . . . . . 62. ^. ««''";2; 



Branches spinescent ^•^* -^" ^^^ ' . 



. (147, A. snbulata, has sometimes the long slender phyllodia scarcely broader than in 

 juncifolia, but is readily distinguished by the small flower-heads several in a racem .; 



Series V. 'BT^xa\o\Ae^,—FhyUodia mcmerous, small, linear'Syhulaie ^^^^^-j ^^ints^ 

 ferta), verticillate, clustered or crowded, obtuse or with innocuous or rarefg '"'^ ,^^j^-^_ 

 Flowers in globular heads or simple axillarg pedimcles^ usually exceeding the p J 



Phyllodia all regularly verticillate. 



Phyllodia- many in the whorl, rigid, almost pungent, ^ to 1 in. ..^ 



Ions:. Petals smooth ^4. A.cear 



Phyllodia 8 to 10 or more in the whorl, slender, under \ in. long. 



Petals striate. ndifoH^* 



Phyllodb recurved at the end, sulcate. Pod sessile . . .65. A. ly(^ P 

 Phyllodia recurved at the end, not sulcate. Pod on a stipes r-j^q 



of2to3Iiues . . . .' f,-i-tu%'- 



Phyllodia straight at the end, sulcate. Pod sessile . • . 60. -A. «7i' 



A. 



