1918] Blake,— Notes on the Clayton Herbarium 53 
THASPIUM TRIFOLIATUM (L.) Gray var. flavum: omnino ut apud 
plantam typicam sed floribus aureis— As TYPE may be designated 
a sheet from ILLINOIS: rich woods, Peoria, May & July, 1904, F. E. 
McDonald (in Gray Herb.) 
8. Azalea lutea L. Sp. i. 150 (1753).\— A. nudiflora L. Sp. ed. 2. 
i. 214 (1762).2— In recent floras Azalea lutea L. has been considered 
identical with A. calendulacea Michx. (= Rhododendron calendulaceum 
(Michx.) Torr.), while A. nudiflora L. (= Rhododendron nudiflorum 
(L.) Torr.) is retained for an entirely different species with pink 
flowers. Comparison of the original descriptions of both species cited 
in the footnotes is sufficient to show, however, that the later A. nudi- 
flora is a mere renaming of A. lutea, since the added citations have 
introduced no new element into the species. ; 
The Clayton plant, type of the Azalea ramis infra flores nudis of 
Gronovius, is Rhododendron canescens (Michx.) D. Don; the specimen 
of Azalea nudiflora in the Cliffortian Herbarium is the R. nudiflorum 
of authors; the Colden plant, from which the specific name first used 
by Linnaeus was derived, was probably R. calendulaceum (Michx.) 
Torr.; and the plant of Plukenet, not now represented by a specimen, 
is scarcely determinable. The material in the Linnaean Herbarium, 
consisting of two sheets from Kalm labelled nudiflora, represents the 
R. nudiflorum of present treatments. The Linnaean Azalea lutea 
(and A. nudiflora, its straight synonym) thus included the three species 
now generally known as Rhodendron nudiflorum, R. canescens, and 
R. calendulaceum. All three were described as new by Michaux in 
1803 under the names Azalea periclymenoides, A. canescens, and A. 
calendulacea. Pursh, the next writer on these species, retained all 
1 Azalea lutea. 
“3, AZALEA foliis ovatis, corollis pilosis, staminibus longissimis. 
“ Azalea ramis infra flores nudis. Gron. virg. 21. 
“ Azalea scapo nudo, floribus confertis terminalibus, staminibus declinatis. Hort. cliff. 69. 
“ Azalea erecta, foliis ovatis integris alternis, flore luteo piloso praecoci. Cold. ebor. 25. 
“Cistus virginiana, periclymeni flore ampliori minus odorato. Pluk. mant. 49. 
“ Habitat in Virginia. h 334 
2 Azalea nudiflora. 5 
“2. AZALEA foliis ovatis, corollis pilosis, staminibus longissimis. Kalm. it. 3. p. 110. 
Duham. arb. 1. p. 85. t. 3. 
“ Azalea ramis infra flores nudis. Gron. virg. 21. 
“ Azalea scapo nudo, floribus confertis terminalibus, staminibus declinatis. Hort. cliff. 69. 
Trew. ehret. 48. 
“ Azalea erecta, foliis ovatis integris alternis, flore luteo piloso praecoci. Cold. ebor. 25. 
“Cistus virginiana, periclymeni flore ampliori minus odorato. Pluk. mant. 49. 
“ Habitat in Virginiae siccis. 
“ Floret ante folia vel sub ipso vernatione & stamina gerit duplo corollis longiora.” 
