338 NATURAL HISTORY OF PLANTS. 
GENERA. 
1. Cistus T.—Flowers regular, generally hermaphrodite ; recep- 
tacle rather convex. Sepals 5, more rarely 3, unequal; 2 exterior 
often much smaller; 3 interior usually convolute ; præfloration 
usually imbricated. Petals 5, more or less opposite sepals, some- 
times alternate, very shortly unguiculate, imbricate or usually con- 
torted, very fugacious. Stamens », hypogynous; filaments free, ex- 
terior sometimes antherless ; anthers 2-locular ; cells longitudinally 
introrsely or laterally dehiscing. Germen free sessile, 1-locular ; 
septa parietal 3 or 5, alternipetalous, more rarely 6—12, more or less 
prominent, sometimes inwardly contiguous ; style simple, very short 
or almost wanting, sometimes cylindrical elongated, apex dilated 
and divided into short lobes (apices of septa) more or less con- 
spicuous stigmatiferous ; ovules on each placenta 2, or oftener o, 
funicle often long extended; orthotropous or very rarely more or 
less adnate to funicle subanatropous. Capsule dehiscent from apex 
to a greater or less distance into valves equal in number to and 
bearing placentas at middle within. Seeds »; testa crustaceous 
(oftener damp exterior mucilaginous) ; albumen farinaceous or sub- 
cartilaginous ; embryo subcentral or oftener excentric, curved con- 
volute, 2-plicate or conduplicate, more rarely suberect ; cotyledons 
flat or semiterete ; radicle remote from hilum or more or less near 
(adnate to funicle).—Herbs, undershrubs, or shrubs; leaves opposite 
or sometimes alternate, simple, subentire; stipules 0, or small, 
sometimes foliaceous ; flowers solitary terminal or falsely racemose 
(cymose) secund (Southern and Mediterranean Europe, Mediterranean 
Africa, South Western Asia). See p. 33 
2. Helianthemum 'l’.— Flowers nearly of (ists, some 2-morphous; 
sepals 83-5. Petals 5, or more rarely 3, sometimes 0. Stamens «, 
exterior sometimes sterile (/wmana). Germen 3-merous; placentas 
or semisepta 3; style often articulate, form longitudinal and 
varied, apex stigmatiferous capitate or cristate-3-lobed. Capsule 
3-valved. Seeds 2; embryo uncinate, 2-plicate or circumflexed.— 
