Onagraric@—Gaura. 203 
from the disappearance of the septa; cells l-seeded. There 
are about a dozen species, from the warmer parts of North 
America. The name is derived from 
yadzov, elevated, probably from the petals 
being directed upwards. 
1. G. Lindheiimeri (fig. 110).—This is 
the only species in general cultivation. It 
is a branching slender herbaceous species, 
bearing its long spikes of white and pink 
flowers in great abundance throughout 
the Summer. 
Orper XLVIIIL—LOASE AL. 
Erect or climbing herbs, destitute of 
tendrils, or more rarely shrubs, frequently 
clothed with bispid often stinging hairs. ‘ 
Leaves opposite ov alternate, entire, 
lobed, pinnatifid or pinnate; stipules 
none. Flowers regular, hermaphrodite, 
solitary, racemose, or cymose or capitate; ~\R 
peduncles often opposite the leaves ; 
pedicels bibracteolate. Calyx-tube ad- 
nate to the ovary, often ribbed and twist- 
ed; limb of 4 or 5 imbricated or contorted 
persistent lobes. Petals 4 or 5, inserted 
upon the throat of the calyx, sessile or 
clawed, flat or hooded. Stamens usually 
numerous, often in bundles opposite tle 
petals, occasionally with intervening 
filiform or petaloid staminodes. Capsule 
Fig. 110, Gaura Lindheimeri. 
(¢ nat. size.) 
commonly 1-celled, with straight or twisted ribs; seeds 1 or 
more, usually minute. Ten genera, containing about one 
hundred species, belong to this order, and, with the exception 
of one monotypic genus from tropical Africa, all are American. 
1. MENTZELIA. 
(Including Bartinia and Bucnide.) 
Herbs with alternate leaves. Flowers large, white or yellow. 
Stamens very numerous. Petals flat. Capsule 1-celled, straight; 
