50 Mr Don on Azalea^ Rhododendron^ Ledum and Leiophyllumr 
found expedient to unite them. The figure of the corolla varies 
much in different species of Rhododendron ; and, therefore, af- 
fords excellent specific characters, such as in R. anthopogon^ 
dauriciimy chamacistus^ chamtschaticumj &c. 
LEDUM, — Linn. Juss. 
Lalyx minimus, 5-dentatus, deflorato evanescente. Corolla 
5-petala, patens. Stamina 10, in disco hypogyno inserta, co- 
rolla longiora : filamenta capillaria : antherae subrotundae, apice 
poris geminis aperientes. Pistillum 1 ; germen subrotundum : 
stylus filiform is, rectus, staminibus brevior : stigma parvum, ca- 
pitatum. Capsula subrotundo-ovata, 5-locularis, 5-valvis, basi 
septicido-dehiscens : valvularum marginibus introflexis, approxi- 
matis. Receptaculum 5-lobum, columella 5-angula pedicella^ 
turn. Semina go , plana, linearia, scobiformia, utrinque in ala 
membranacea desinentia. 
Fruticuli ramosissimi, erecti vel decumbentes, Ramuli ju- 
niores, tomentosi. Folia alterna, nunc linearia, nunc lanceolata 
aut elliptica, margine integerrima et revolata, supra nuda, reti- 
culatim venosa, subtus lana fulva instructa ; quando contrita 
odorem aromaticum emittunt. Flores albi, pedicellati, in corym- 
bis terminalibus densi. 
LEIOPHYLLUM.—P^r.9007i Syn. 
Ammyrsine Pursh. Ledi species Hort. Kew. et Willd. Ca- 
lyx prof unde 5-partitus, persistens. Corolla 5-petala, hypogyna. 
Stamina 10, hypogyna, corolla longiora : filamenta capillaria, 
glabra : antherse subrotundae, laterales, interne longitudinaliter 
rumpentes, Pistillum 1 : germen subrotundum, glabrum : sty- 
lus filiformi^, gracilis, rectus, staminibus longior : stigma par- 
vum, capitatum. Capsula subrotundo-ovata, stylo persistente 
rostrata, 5-locularis, 5-valvis, rarius 3-locularis, 3-valvis, [apice 
septicido-dehiscens: valvis ovatis : marginibus introflexis, remo- 
tis, rectis. Columella subovata, teretiuscula, rugosa. Semina 
GO , minuta, laevia, aptera. 
Fructiculus erectus, ramosissimus, sempervirens, rigidus, 
foliosus, Folia sparsa, parva, ovalia, plana, integerrima, coria- 
