This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Curious herbs with rather small flowers, remarkable in having only one antheriferous stamen, and one petaloid. L. coronata is an interesting annual about 2 feet high, with alternate ovate-lanceolate serrate petiolate leaves and rose-purple flowers. The petals are renexed, and are deeper coloured towards the base. There are six species reported from Central America.
Annual or perennial herbs, rarely shrubby. Leaves alternate, simple, entire, dentate or sinuate. Flowers sessile or pedicellate, in racemose spikes. Sepals and petals 3 or 4. Stamens 6 or 8, declinate; filaments slender, with a scale-like appendage at the base. Fruit indehisceut, 3- or 4-celled, or 1-celled from the disappearance of the septa; cells 1-seeded. There are about a dozen species, from the warmer parts of North America. The name is derived from elevated, probably from the petals being directed upwards.
1. G. Lindheimeri (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.
Fig. 110. Gaura Lindheimeri. (1/4 nat. size.)