180 



ACACIA 



they are very valuable acquisitions to our Easter plants 

 The acacia has two distinctive charms: the foliage is 

 either small, simple and glaucous, as in A. armata, or 

 much divided, graceful and fern-like, as in A. pubescens. 

 All the acacias are among the freest-flowering of our 

 hard- wooded plants. (William Scott.) 



INDEX. 



KEY TO THE SPECIES. 

 A. Lvs. reduced to phyll. (i. e., the petiole 



is flattened to resemble a simple If.). 

 B. F Is. in globular heads. 



c. Phyll. terete or slightly flattened. 

 D. The phyll. tapering into points. 



E. Funicle filiform to its end 1. juniperina 



BE. Funicle ending in enlarged aril. 

 F. Fls. cream-yellow; phyll. 



slender, broad at base. ... 2. tenuifolia 

 FF. Fls. rich yellow: phyll. thick, 



narrower at base 3. diffusa 



DD. The phyll. with innocuous points, 



not pungent. 

 E. Peduncle usually more than 1- 



headed 4. calamifolia 



EE. Peduncle mostly 1-headed. 



F. Phyll. obscurely nerved 5. juncifolia 



FF. Phyll. prominently nened, 



st. almost winged 6. extensa 



cc. Phyll. vertically flattened. 



D. Veins of phyll. 1 , or very rarely 2. 

 E. Fl.-heads solitary or in pairs or 



clusters. 



F. Length of phyll. 1 in. or less, 

 a. Stipules persistent as 



slender spines. 

 H. Pods hirsute. 



i. Phyll. semiovale 7. armata 



n. Phyll. wedge-shaped. . 8. cuneata 

 HH. Pod glabrous: phyll. 

 triangular or rhom- 



boidal 9. decipiens 



oo. Stipules deciduous, small 



or none. 

 H. Peduncles shorter than 



phyll 10. Meissneri 



HH. Peduncles longer than 



phyll. 

 I. Nerve near one edge: 



phyll. r-iin. wide.. .11. lineata 

 ii. Nerve central: phyll. 

 over rsin. wide. 



ACACIA 



j. Phyll. orbicular. . . 12. obliqua 



jj. Phyll. oblong 18. acinacea 



FF. Length of phyll. 1 Yi-4 in. 



G. More or less spinescent.. .21. sentis 



GG. Not spinescent 14. dodonseifolia 



EE. Fl.-heads in axillary racemes 

 (rarely reduced to a solitary 

 head). 



F. Length of phyll. 2 in. or less. 

 G. Racemes much exceeding 



phyll. 



H. Phyll. hoary or pubes- 

 cent 15. podalyrise- 



HH. Phyll. glabrous. [folia 



i. The phyll. nearly as 



broad as long, 

 j. Shape of phyll. 



obliquely ovate. . 16. cultriformis 

 jj. Shape of phyll. tri- 

 angular 17. pravissima 



II. The phyll. oblong-fal- 

 cate, not so broad as 



long 1*<. lunata 



GG. Racemes not or only 

 slightly exceeding phyll. 

 (except A. linifolia var. 

 prominens) . 



H. Phyll. obliquely obovate.19. brachybotrya 

 HH. Phyll. lanceolate (often 



3 in. long in Calif.) . . 20. myrtifolia 

 HHH. Phyll. linear. 



i. Stipules spinescent.. .21. sentis 

 ii. Stipules not spines- 

 cent. 



j. Gland at base 22. linifolia 



jj. Gland below middle 22. linifolia var 

 FF. Length of phyll. over 2 in. (ex- [prominens 



cept A. salicina var. Wayse). 

 G. Some of phyll. over 1 in. 



wide. 



H. Funicle encircling seed 

 and bent back in dou- 

 ble fold. 



i. Pod l /iin. wide 23. falcata 



ii. Pod over Y\in., nearly 



y^in. wide 24. penninervis 



HH. Funicle not encircling 



seed. 



i. Phyll. sickle-shape.. .25. pycnantha 

 II. Phyll. not sickle-shape. 26. saligna 



27. cyanophylla 

 OG. All phyll. under] in. wide. 

 H. Phyll. linear-lanceolate, 

 mostly widest above 

 middle. 



i. Midrib much to one 

 side, gland one- 

 third from base, 

 making a notch. ... 28. obtusata 

 n. Midrib central or 

 nearly so, gland \- 



%in. from base. 

 j. Funicle surround- 



ing seed 29. retinodes 



jj. Funicle not sur- 

 rounding seed. . . 30. neriifolia 

 HH. Phyll. linear-oblong, not 



widest above middle. 

 i. Seeds nearly trans- 

 verse 31. suaveolens 



II. Seeds longitudinal. 



j. Racemes compound^, macradenia 

 jj. Racemes simple, 

 often reduced to 

 2 or S heads. 



K. Foliage pale.. . .33. salicina 

 KX. Foliage dark 



green 33. salicina var. 



DD. Veins of phyll. several (rarely [Wayse 



only 2), longitudinal. 

 E. Fl.-heads in racemes. 



F. Phyll. 2-nened 34. binervata 



FF. Phyll. more than 2-nereed. 



G. Pod with narrow wing. . .35. pendula 

 GG. Pod not winged. 



H. Funirle encircling seed 



in iloublefold 86. melanoxylon 



