58 ZYGOPHYLLACEAE. [ Tribulus. 
the back of the spur. No glands. Stamens 10, connate at the base, 
unequal, 3 generally without anthers. Carpels and styles as in Geranium. 
— Tall herbs or shrubs, mostly belonging to South Africa. 
+1.P.zonale, Willd. — Stem fleshy-frutescent. Leaves orbicular, cordate, 
shortly and obtusely lobed. Flowers in umbels on long peduncles, the 
pedicels glandular-pubescent. Petals bright red, the 2 upper shorter 
and narrower. 
An occasional escape from cultivation. 
4. TROPAEOLUM, L. 
Calyx spurred, the spur free. Two upper petals larger and inserted 
near the spur, the 3 lower on claws. No glands. Stamens 8, free, unequal, 
all antheriferous. Ovary 3-lobed. Carpels fleshy and rugose when mature, 
seceding from the short axis without opening. — Diffuse or climbing 
herbs, all South American. 
71. T. majus, L. — A fleshy climbing herb with orbicular peltate leaves 
and large yellow or orange flowers. 
The Nasturtium of the gardens, runs wild in Kula! Maui. 
Orpen XVII. ZYGOPHYLLACEAE. 
Sepals 5(—4), generally imbricate. Petals 5(—4), hypogynous, imbricate 
or contorted. Stamens of the same number or 2 or 3 ti as 
Ovary sessile or raised, generally 5—4-celled, each cell with 1 or few 
capsule. Embryo straight, with plane cotyledons; albumen corneous or 
none. — Herbs, shrubs or small trees, with stipulate, usually pinnate and 
opposite leaves, devoid of pellucid dots. 
An Order chiefly tropical, occupying both hemispheres, but wanting in eastern Asia 
and Malaysia. 
1. TRIBULUS, L. 
alternate ones with a gland on the outside of the base. Ovary sessile, 
» With an equal number of stigmas on a short style, the cells 
often partitioned by horizontal dissepiments. Ovules 1—5 superposed in 
each cell. Fruit of 5—12 indehiscent cocci, which are hard and spinescent. 
Albumen none, — Herbs, with abruptly pinnate leaves and solitary 
axillary flowers, 
About 15 species, distributed over the warm regions of the globe. 
