192 CYCADACEA. 
latere spinulis pungentibus basim versus integerrimis, inferioribus in dentes palmatifidos desi- 
nentibus. Sérodili.......0+. 
Souta Mexico, Tuxtla; Yucatan, Progreso (C. J. Hége). Herb. Kew. 
EXPLANATION OF TAB. LXXXII. 
The figures represent the upper and lower portions of a leaf of the Yucatan specimen of the 
natural size. 
2. CERATOZAMIA. 
Ceratozamia, Brongn. in Aun. Sc. Nat. série 3, v. (1846), p.7,t.1; Benth. et Hook. Gen. Pl.iii. p. 446. 
Dipsacozamia, Lehm. (sic) in Lindl. Veg. Kingd. p. 225 (momen tantum). 
About four species, restricted to Mexico. 
1. Ceratozamia miqueliana, Wendl. Ind. Palm. p. 68; DC. Prodr. xvi. 2, 
p. 047. (Tab. LXXXIIL) 
Ceratozamia ghiesbreghtii, Hort. Linden. ex Regel, Cycad. Gen. et Sp. Rev. p. 27. 
Mexico. Hort. Kew. . 
As Miquel points out (Prodr. Syst. Cycad. p. 22), this species differs from all the 
rest, “quod foliola pedetentim proferat.” Notwithstanding this, the male and female 
cones, which have not hitherto been described, fully accord with those characteristics 
of the genus. For material for the figure of the former I am indebted to Mr. W. Bull, 
F.L.S., of the King’s Road, Chelsea; for that of the latter to Prof. Kichler, Director of 
the Royal Botanic Garden, Berlin. 
EXPLANATION OF TAB. LXXXIII. 
Fig. 1, male plant (reduced); 2, upper portion of leaf; 3, male cone; 4,5, & 6, upper, lower, and 
lateral views of scale of male cone; 7, female cone: figs. 2-7 all natural size. 
2. Ceratozamia latifolia, Mig. in Wiss. Tijdschr. i. p. 206; DC. Prodr. xvi. 
2, p. 047. 
Ceratozamia karsteniana, Hort. Kew. 
Mexico, Mirador (Liebmann). Hort. Kew. 
3. Ceratozamia mexicana, Brongn. in Ann. Sc. Nat. série 3, v. p.7, t. 1; DC. 
Prodr, xvi. 2, p. 546. 
Ceratozamia brevifrons, Mig. in Wiss. Tijdschr. 1. p. 41 (a young state). 
Zamia atropurpurea, Parment. ex Miq. Prodr. Syst. Cycad. p. 238. 
Dipsacozamia mexicana, Liebm. ic. ined. in Herb. Haun. 
Mexico (Ghiesbreght), Mirador (Liebmann). 
I am quite unable to discriminate between this and a number of other forms which 
have been regarded as species by Miquel and others. The character of the foliage of 
all Cycads, as already remarked under Dioon, more or less alters with the age of the 
plant that bears it. For this reason the type plants which are preserved in botanic 
gardens constantly outgrow the diagnoses originally based upon them. This variable- 
ness with age makes the separation of nearly allied forms an all but hopeless task. _ 
The following varieties may be maintained for convenience :— 
