GENERA AND SPECIES. 25 
ORDER MELIACEAE. 
Owenia. 
‘Stamens 10, staminal tube toothed between the anthers ; ovules 
solitary i in each cell; fruit drupaceous. 
A small tree, leaves pinnate ; leaflets numerous lanceolate, 
acute, l-nerved.. ae a a an 5h ... acidula 
ORDER LINEAE. 
Linum. 
Erect glabrous herb; petals blue without SPPBREATES + ; styles 
5 united to the middle ; leaves narrow ... ... marginale 
ORDER ZYGOPHYLLEAE. 
Leaves pinnate, flowers solitary, fruit of hard indehis- 
cent coherent nuts. Prostrate hairy herbs ... Tribulus 
Leaves of two succulent leaflets or lobes; flowers soli- 
tary; petals 4 or 5, flat, thin, usually yellow ; fruit 
3- to 5-angled or- lobed, bursting arenER LD or 
indehiscent _... ; . Zygophyllum 
Leaves simple succulent ; Hee in cymes ; petals con- | 
cave; fruit adrupe ... oar oS a .. Nitraria 
Tribulus. 
Each fruitlet rounded at the back, prickly. 
Leaflets small obliquely oblong, in 4 to 8 pairs; 
flowers usually small; stamens 10; fruitlets 5, 
with 2 marginal conical prickles ... — terrestris 
Flowers usually larger ; fruitlets covered eeith 
numerous nearly equal prickles i hystrix 
Each fruitlet with prominent almost mee angles 
and 2 dorsal prickles ... ve . macrocarpus 
Fruit with 5 wingless rays near the ae a 
basal tubercles ... ass 4. ... astrocarpus 
Zygophyllum. 
1. Capsule truncate at the top. 
Sepals and petals 5; filaments broadly winged to the 
middle ; angles of the capsules produced into blunt 
appendages; leaflets ovate, oblique... Wy, ... apiculatum 
Sepals and petals 4; filaments not winged. 
Angles of the capsule with membranous wings. 
Flowers large yellow, stamens 8; seeds 4 to 6 
inacell. A low lax shrub ... Ms ... fruticulosum 
