A. H. Moore descriptae. Potamogetones novae ab Arthur Bennett descriptae. 87 
R. cymosa El. et R. alba (L.) Vahl achaeniis percorrugatis. 
R. fascicularis (Michx.) Vahl et R. distans (Michx.) Vahl achaeniis 
colore e nigro rutilo, medio luteis. 
2. Elaeodendron Laneanum A. H. Moore, |. c., p. 13, pl. III. 
Arbor 12—18 m alta, plerumque ad 2—3 m a terra copiose rami- 
ficans; foliis obovatis, conspicue mucronulato-crenatis, margine parum vel 
omnino non revoluto, apud basim attenuatis, brevipetiolatis, glabris non 
nitidis, 4,5—7 cm longis, 2,5—3,5 em latis; inflorescentia ex corymbis 
densis umbelliformibus constante, floribus brevipedunculatis (pedunculis 
0,1—1,4 em longis, pedicellis 3—5 mm longis), nec dichotome nec tricho- 
tome ramificante; fructibus plerumque bini, brevipedunculatis, apice mucro- 
nulato sed raro vel nunquam attenuato; in regione walsinghamensi in 
parochia hamiltonensi in sicco crescens. (M. Lane. n. 365). 
E. xylocarpum (Vent.) DC. (Cassine xylocarpa Vent.). A nostra specie 
longe differt foliis fere integris, vix vel nullo modo apud basim 
attenuatis; fructu obtuso. 
E. attenuatum Rich. fructu longe attenuato; foliis nitidis, fere integris 
margine revolutis. 
E. dioicum Griseb. foliis majoribus (8,5—12,5 em longis, 4,5—9,5 cm 
latis) apud basim vix attenuatis. 
Tres species illae a nostra longe distant inflorescentia dichotome vel 
trichotome ramificante. 
XXX. Potamogetones novae ab Arthur Bennett descriptae. 
(Ex: Ann. Cons. et Jard. Bot. Genève, IX [1905], pp. 98—105.) 
1. Potamogeton lucens L. subsp. vaginans Bojer (sp.) MS. apud Bennett, 
Ll o D. 94 
Stems long, semiterete, slender below, lower internodes long, upper 
6—12 lin. long., strongly striated when dry. 
Leaves all submerged, sessile or semiamplexicaul, undulate, entire on 
the margin. Upper lanceolate, lower oblong-lanceolate 9-veined, the cen- 
tral nerve thick, those near the margin faint, cross-nervation faint, a re- 
gular network of interspaces!) (on an average about 280 to the leaf), 
without cancellate areolation, 2—41/, inches long X !/,—?/," wide; on 
either side of the central nerve there is a network of irregularily disposed 
faint nervation, especially towards the apex of the leaf, less so towards 
the middle, and dying out towards the base of the leaf. Stipules as long 
as, or longer than the upper internodes, very thin and translucent, soon 
decaying, acute. 
Peduncule 2 inches stout, slightly enlarging upwards. Spike 1 inch, 
flowers numerous, not interrupted. Sepals (perianth-segments) oblong- 
orbicular. 
1) In P. lucens these average about 700 to the leaf. 
