CYCADACEA, 191 
which he had prepared from them. The four species (which he discovered in 1841) 
were Dioon edule (two forms), Ceratozamia mexicana, and) Zamia lerboldii. 
1. DIOON. 
Dioon, Lindl. Bot. Reg. 1843, Misc. p. 59 (Dion). 
Platyzamia, Zucc. in Abhandl. bayer. Akad. iv. p. 23, t. 4. 
Two species peculiar to Mexico. 
1. Dioon edule, Lindl. Bot. Reg. 1843, Misc. p.59. (Tab. LXXXI. figg. 1, 2.) 
Dioon edule, Miq. in Act. Inst. reg. Sc. Neerl. ser. 3, iv. p. 2, tt. 3 et 4. figg. a,b,c; Lem. in Il. 
Hort. ii. p. 91, cum tt.; DC. Prodr. xvi. 2, p. 537. 
Dioon imbricatum, Miq. in Wiss. Tijdschr. i. p. 36 ; Act. Inst. reg. Sc. Neerl. ser. 3, iv. t. 4. figg. d, e. 
Dioon angustifolium, Mig. in Wiss. Tijdschr. i. p.37; Act. Inst. reg. Sc. Neerl. ser. 3, iv. t. 4. fig. f. 
Dioon aculeatum, Lem. in Ill. Hort. ii. Misc. p. 91. 
Platyzamia rigida, Zuce. in Abhandl. bayer. Akad. iv. p. 23, t. 4. 
Zamia meleni, Miq. in Linn. xviii. p. 97. 
Zamia friderici-guilielmi, Hort. Parmentier, ex Mig. Prodr. Syst. Cycad. p. 22. 
Macrozamia pectinata, Liebm. ic. ined. in Herb. Haun. 
Macrozamia littoralis, Liebm. ic. ined. in Herb. Haun. 
- Sourn Mexico, Colipa and Laguna verde (Liebmann). Hort. et Herb. Kew. 
The leaves vary very much in size and form in different individuals, and especially, 
as is usual in Cycads, with the age of the plants bearing them. The segments may be 
linear or broad, and distant or closely imbricated; in very young leaves they are often 
spinulose towards the apex. 
The male plant has been well figured in Bot. Mag. t. 6184; Zuccarini’s figure of the 
female cone is altogether inadequate, and that given in Plate LX XXTI has therefore 
been prepared from a female cone produced at Kew. 
EXPLANATION OF TAB. LXXXI. Fiee. 1, 2. 
Fig. 1, female cone, natural size; 2, detached scale. 
p. latipinna, Dyer. (Tab. LXXXI. figg. 3-5.) 
Segmenta 2 pollice lata, inferiora apicem versus spinulosa. 
SoutH Mexico? Hort. Kew. 
EXPLANATION OF TAB. LXXXI. Fiee. 3-5. 
Fig. 3, basal portion of rachis of leaf, showing dentate reduced segments; 4, segment from lower 
_ part of leaf, with spinulose apex; 5, segments from middle of leaf: all natural size. 
— [Dioon strobilosum (Lem. in Ill. Hort. 10, Misc. p. 4; D. strobilaceum, DC. Prodr. 
x vi. 2, p. 537) is unknown to me. It may possibly be a state of D. edule. | 
2. Dioon spinulosum, Dyer; Eichler in Gart. Zeit. 1883, p. 411. (Tab. 
LXXXIZ.) 
Folia breviter petiolata, elongato-lanceolata, rigida, plana, pinnatisecta, ad 3 pedes longa; segmentis 
circiter 70 utroque latere, mediis majoribus suboppositis lineari-lanceolatis breviter acuminatis 
18-23-nerviis, ad 4 pollices longis media latitudine semipollicaribus, basi angustiore, utroque 
