NATIVE WOODY PLANTS OF THH UNITED STATES D225 
Rhamnus rubra Greene. Redstem buckthorn. 
Range: 4. 
Site: Well-drained, sun. 
Fruit: Drupe, available August-September. 
A small shrub; flowers in June; susceptibility to crown rust of oats not 
known. 
Rhamnus smithii Greene. Simith buckthorn. 
Rk. fasciculata Greene. 
Range: 11, 18, 14. 
Site: Well-drained, moist, sun. 
Fruit: Drupe. 
A small to large, dioecious, densely leafy shrub; susceptible to the crown rust 
of oats. 
Rhamnus texensis, see Colubrina texensis. 
Rhamnus tomentella, see Rhamnus californica. 
Rhamnus ursina, see Rhamnus californica. 
Rhapidophyllum hystrix (Fraser) Wendl. and Drude. Needle palm. 
Chamaerops hystriz Fraser, Corypha hystriv (Fraser) Desf., Sabal hystriz 
Desf. 
Range: 29, 30. 
Site: Dry, well-drained, sun. 
Fruit: Drupe. 
A small to large evergreen shrub; rootstocks creeping and rooting. 
Rhododendron spp. 
This genus has often been divided into several separate genera or genus 
sections. The most notable for the United States are rhododendron and azalea. 
It is generally agreed among botanists that these two cannot be maintained as 
separate genera although they may well appear to be separable as far as the 
species in this country are concerned. They are here treated as one. The 
species popularly known as azaleas are largely deciduous, at ieast in North 
America. Those known as rhododencdrons are mostly evergreen. The azaleas 
are generally to be found growing in the sun; the rhododendrons make their 
best growth in the shade. Nevertheless, there are no constant botanical char- 
acters to separate them. 
Rhododendron alabamense Rehd. Alabama azalea. 
Azalea alabamense (Rehd.) Small. 
Range: 28, 29, 30. 
Site: Dry, well-drained, sun. 
Fruit: Capsule. 
A small shrub; flowers April—May. 
Rhododendron albiflorum Hook. White-flowered azalea. 
Azaleastrum albiflorum (Hook.) Rydb., Azalea albiflora Kuntze., Cladotham- 
nus campanulatus Greene. 
Range: 4, 12. 
Site: Well-drained, shade. 
Fruit: Capsule. 
A small to large shrub; fiowers June-July. While under normal range con- 
ditions it is not palatable to livestock, it is nevertheless poisonous. 
Rhododendron arborescens (Pursh) Torr. Smooth azalea. 
Azalea arborescens Pursh. 
Range: 27. 
Site: Well-drained, moist, sun, shade. 
Fruit: Capsule. 
A small to large shrub or rarely a small tree; flowers June—July. 
Rhododendron atianticum (Ashe) Rehd. 
Azalea atlantica Ashe. 
Range: 28, 29, 30. 
Site: Dry, well-drained, sun, half shade. 
Fruit: Capsule. 
A small shrub; flowers April-May; mat forming; aggressive; spreads by 
means of stolons; many often invade fields. 
