48 Rhodora [Marcu 
lanceolata, longé petiolata, circa 29 em., longa et 25 mm. lata, utrinque 
sparsé pubescentia. Folia caulina gradatim breviora, breviter petio- 
lata. Caulis teres, subglaber, basi ramis pluribus verticillatis ascend- 
entibus ipsum saepe excedentibus instructus. Spica sublaxa, superne 
nutans. Petala flava, circa 20 mm. longa, ascendentia. Antherae 
stigmata attingentes. Alabastrae subglabrae, obsolete quadrangu- 
lares, apices sepalorum subterminales. 
ROYAL COLLEGE OF SCIENCE, LONDON. 
EXPLANATION OF PLATES. 
Plate 100. Oenothera angustissima, sp. nov. Rosette, showing the begin- 
ning of the crown branches before the central stem appears. 
Plate 101. The same. Two flowering shoots showing leaves, flowers and 
fruits; and three leaves from the mature rosette. 
SYSTEMATIC STUDIES ON OENOTHERA,— II. THE DE- 
LIMITATION OF OENOTHERA BIENNIS L. 
Harvey Harris BARTLETT. 
(Plates 102 and 103.) 
Tue problem of limiting the application of the name Oenothera 
biennis L. to one of the many forms which now pass under this name is 
largely bibliographical, to be solved by a careful analysis of the 
Linnaean account (Sp. Pl. ed. 1. p. 346. 1753.) which is quoted below: 
biennis 1. OENOTHERA foliis ovato-lanceolatis planis. Vir. cliff. 33. Hort. 
ups. 94. Gron. virg. 254. Roy. lugdb. 251. Gort. gelr. 78. 
Oenothera foliis ovato-lanceolatis denticulatis, floribus lateralibus 
in summo caulis. Hort. cliff. 144. 
Lysimachia lutea corniculata. Bauh. pin. 245. 516. * Moris. 
hist. 2. p. 271, f. 3, t. 11, f. 7. 
Habitat in Virginia unde 1614, nunc vulgaris Europae. c 
Although no part of this account is original to the Species Plan- 
tarum, Linnaeus was himself the author of the first two of the three 
polynomials of which it consists. In 1737 Linnaeus published com- 
panion works, the Viridarium Cliffortianum and the Hortus Cliffort- 
ianus, in which these polynomials first appeared. We find in the 
