THE 
JOURNMEO OFT BOTAR?T 
BRITISH AND FOREIGN. 
ON CYCAS TAIWANIANA, sp. Nov., AND C. SEEMANNI A.Br. 
By W. Carrutsers, F.R.S. 
(Puates 330, 881). 
Tue characters employed in grouping t the different species of 
the genus Cycas are 1 ot altogether et, No doubt this is 
being the revolute mar, or the more or less flat nature of the 
segments. But t he fact a in the most characteristic revolute 
species (C. revoluta L.) there are plants with flat margins shows 
(C. Beddomei Dyer) | has its affinities with the C. circinalis and the 
Australian species, and not with C. revoluta or C.inermis. Neither can 
this depends in several species on the age of the spa ix. i dt 
appears to me, looking at the materials existing in the Herbarium 
of the British Museum, and at the published figures and descrip- 
tions, that the form of the barren expansion in the female spadices 
will supply, in the present state of our Loaledes, “sone characters 
for g a than any hitherto suggested. Three types are 
resen 
: First - Where the apex is dilated into rhomboidal lamina, yas 
teeth on the two upper margins of the rhomb, the terminal on 
being usually much larger. To this poe ae C. circinalis, C. 
Rumphii, C. Seemanni, the Australian species, &c, 
Seco: ae Where the lamina is af ae broad, and is deeply 
Linn., C. inermis Lour,, and C OT enione hee deseri bed. 
Third. Where the lamina is broader than long, and the spiny 
teeth are borne chiefly on the upper ma rgin. To this group 
belong the species discovered a figured by W, Griffith,—C. pec- 
tinata Griff., C. Jenkinsiana Griff., C. macroca saa ne The ‘materials 
for the history of this group are still very imperfect 
the arium of Dr. Hance, which was some years ago 
JOURNAL OF Serie’ ou. 81; [Janvary, 1893.] 
