54 Rhodora [Marcu 
Michaux’s names, referring A. nudiflora Willd. Sp. i. 831 (i. e. A. lutea 
L., A. nudiflora L.) to A. periclymenoides, and his action must be taken 
as determining the application of the name, particularly since he was 
followed by Torrey in 1824 when the latter transferred these species 
to Rhododendron. The name Azalea nudiflora or R. nudiflorum has 
thus become definitely fixed on the A. periclymenoides of Michaux, 
and its straight synonym A. lutea must be attributed to the same 
species. The specimen in the Hortus Cliffortianus may be considered 
the type. As it happens, however, the name lutea cannot be taken up 
for our common pink-flowered Azalea, because of the valid Rhododen- 
dron luteum Sweet, Hort. Brit. ed. 2. 343 (1830), applied to a species 
of Turkey and validated by his reference to plate 433 (1799) of the 
Botanical Magazine. The combination Rhododendron luteum, based 
on Azalea lutea L., has recently been made by Schneider (Ill. Handb. 
Laubholzk. ii. 500 (1911); see also p. 1046, where R. calendulaceum 
is adopted in place of his R. luteum on account of the prior homonym 
of Sweet), but unfortunately he follows our recent manuals instead of 
the earlier and correct disposition of the name in the Synoptical Flora 
(ii. pt. 1. 41 (1878)), and refers the name to R. calendulacewm, retain- 
ing R. nudiflorum as a distinct species. Those who retain the genus 
Azalea as distinct from Rhododendron, however, must either adopt A. 
lutea for the pink-flowered species or take up Michaux’s A. pericly- 
menoides and discard altogether A. lutea and A. nudiflora. 
(To be continued.) 
Gray HERBARIUM. 
