DICOTYLEDONS. Ill 



5 distinct petals or 5-cleft ; stamens 5-10, distinct ; ovary 

 nearly sessile, flat, several-seeded. 



A. Illixoexsis (Michx.) Kiintze. Dksmaxtiius. Stem erect 

 or ascending, glabrous, 1-4 ft. high ; pinnae 6-1-i pairs, each with a 

 minute gland at tlie base ; leaflets 2()-;30 pairs, small, linear ; heads 

 globose ; stamens 5 ; legumes several, on a peduncle 2-3 in. long, 

 curved, flat, 2-valved, 3-()-seeded. ]\Iay-July. Open sandy fields. 



II. MORONGIA. 



Perennial herbs ; stems decnmbent or prostrate, jn-ickly, 

 2-5 ft. long; leaves bi-pinnate ; sti[)ules setaceous; flowers 

 perfect or polygamous, in axillary peduncled heads ; calyx 

 minute ; corolla tubular, 5-cleft ; stamens 8-10, distinct ; 

 legume long, prickly, 1-cellpd. 



M. AXGusTAiA (T. & G.) Britt. Sexsitivk-uuikr. Stem 

 armed with numerous, weak, recurved prickles ; leaves petioled, 

 pinn?e 4-G pairs; leaflets 12-15 pairs, linear, elliptical, very faintly 

 veined ; flowers piidv, in dense lieads, peduncles shorter than the 

 leaves ; legumes narrowly linear, long-pointed, prickly, 4-valved, 

 several-seeded. May-August. On dry soil. 



III. ACACIA. 



Trees or shrubs ; leaves pinnately compound or decom- 

 pound ; flowers perfect or polygamous, in spikes or heads ; 

 calyx 4-5-toothed ; petals 4-5, distinct or united ; stamens 

 numerous, distinct; legumes 2-valved, many-seeded. 



1. \. Fai{\ksi.\na Willd. Opoi'oNAX. Shrubs: sttMn s]uny, 

 branching, glabrous, 2-1 ft. high; heaves twice-pinnate; leaflets very 

 nuuHM-ous, small, narrowly oblong; stipul(^s large s]^ines; licads on 

 long axillary ])<Mluncl('s ; flowers yellow, fragrant; it'gumt' long and 

 sl<'nder, twisted. May-July. IntrodnctMJ in waste places. 



2. A. rrrLiHKissiN AVilld. Chimson Acaciv. A large shrnb; 

 stem erect, smooth, glabrous; leaves deconijionnd, i>iniia' .S-12 pairs; 

 leaflets 2.">-3() )>airs, oblong, oblique ; heads few-flowered, in terminal 

 panicles; flowers large; stamens l)right crimson, exserted, 3-4 in. 

 long; legume flat, few-seeded. M.iy duly. I nlfodnced and escaped 

 liom ganlens. 



