64 NATURAL HISTORY OF PLANTS. 
separating from and narrower than dilated persistent margin, more 
rarely broader not articulated. Seeds oblong, sub-4-gonal ; funicle 
short.—Herbs or undershrubs, prickly; leaves (of Mimosa) often 
sensitive; petiole glandless, often setigerous between pinne ; stipules 
setaceous; flowers in spikes or heads; inflorescence axillary solitary 
or fascicled (Zropical America and Africa)\.—See p. 82. 
16. Leuczena Brnto.—Flowers 5-merous (of Mimosa), herma- 
phrodite or polygamous. Petals free valvate. Stamens 10, hypo- 
gynous. Germen stipitate o-ovulate; stigma dilated concave. 
Legume stipitate broadly-linear plano-compressed rigid membranous, 
continuous within, 2-valved. Seeds transverse ovate compressed.— 
Trees or shrubs, unarmed; leaves small or large, pauci- or -jugate, 
oblique; petiole often glandular; stipules minute or setaceous ; 
flowers in globose heads, sometimes bracteate at base, or in a 
terminal leafless raceme (Al tropical regions, Pacific Ocean).—See 
p. 33. 
17. Desmanthus W.—Flowers minute (of Mimosa) 5-merous, 
hermaphrodite or polygamous, lower often male or neuter. Calyx 
shortly toothed, valvate. Petals free or cohering to a variable 
height, valvate. Stamens 5-10, free. Germen -ovulate. Legume 
linear, straight or more rarely falciform, plano-compressed acute 
membranous-coriaceous, continuous or subseptate within, 2-valved. 
Seeds oblique or descending ovate compressed.—Undershrubs or 
perennial herbs; branches slender angularly striated; leaves 2-pin- 
nate; leaflets minute; stipules setaceous persistent; petiolar gland 
usually 1 between lowest pair of pinne; flowers in minute few- 
flowered ovate-globose pedunculate axillary solitary heads (AU tropical 
regions, North and South America).—See p. 34. 
III. PARKIEA. 
18. Parkia R. Br.—Flowers 5-merous, either all hermaphrodite 
or the lower male or neuter; receptacle long tubular. Calyx gamo- 
sepalous tubular, 5-lobed at apex ; lobes unequal imbricated 2-labiate ; 
2 anterior lobes larger. Petals 5, equal linear-spathulate, free or 
connate to a variable height, valvate. Stamens 10; filaments mona- 
delphous at base, adnate to or free from corolla, finally becoming free 
