CXXIV. CYCADACEiE. 1503 



2. MACROZAMIA, Miq. 



(Long-Zamia.) 



Cones of both sexes ovoid oblong or oylindrieal, or the females rarely nearly 

 globular, the scales hard, more or less thickened at the apex, with an erect 

 :spreading or rarely recurved point, either broad and short or elongated and 

 narrow. Scales of the females with one pendulous ovule and seed on each side. 

 — Trunk and leaves of Cycas, except that the pinnfe have no midrib, but are more 

 or less distinctly striate, especially on the under side, with several parallel equal 

 veins, the whole leaf occasionally slightly twisted in some species, but not 

 ■constantly so in any one. 



The genus is limited to Australia, and there represfeuts the South African Enceplialartos, 

 -with which P. v. Mueller reunites it. The latter genus has, however, a much more rigid 

 habit and very obtuse or truncate cone-scales, which, together with the geographical distribution 

 seems to warrant the following Miquel and A. de Candolle, in maiutaing the two genera as 

 distinct. Still less does it seem advisable again to reduce these Old World forms to the 

 American genus Zamia, characterized by the articulate attachment of the pinnse as well as by 

 ■the cones. 



^Scale spines erect. 



Stems seldom raised above the ground. 

 Leaves 3ft. long ; pinnse not reaching to the base. Petioles and 



rhachis flat. Female cones oblong about Jft. long 1. 31. plati/rliachie. 



Leaves 2ft. long spirally twisted ; pinn£e not reaching to the base 



and very narrow. Female cones conical about 5 lines long . . 2. M. Paulo-Gulielini. 

 Stems sometimes slightly raised above the ground. 



Leaves slightly twisted, 2 to 5£t. long, lowest pinnas distant from 



the base. Female cone 6 to Sin. long 3. Jl/. spiralis. 



Leaves 6 or more ft. long, nearly straight ; pinnas reaching to 

 the base where they become spine-like. Female cones 8 to 16in. 



long i. M. MiqueUi. 



leaves about 5ft. long ; the lower pinnffi not abbreviated to spines 

 but only slightly shorter leaving a petiole like in 31, spiralis. 



Female cones 8 to 16in. long 5. SI. mountperriensis. 



Leaves 7 to 8ft. long, pinnse not reaching within l^ft. of the base. 



Female cones 9 to lOin. long &. M. Douglasii. 



Stems tall. 



Leaves greyish very rigid, 7 to 10ft. long ; pinniE reaching to the 

 base where they are snorter and spine-like. Female cones 2 to 



8ft. long 7. ilT. 3Ioafei. 



Scales recurved. 

 Stems tall. 

 Leaves 7 to 10ft. long angular at the base ; pinnse Jin. broad. 



Female cones IJ to 2ft, long. Scale point obtuse or lanceolate . 8. M. Denisonii. 

 Leaves 7ft. long, enlarged at the base of petiole. Female cone 2ft. 



long. Scale point blunt, or somewhat lobed 9. M. Hopei. 



1. IVC. platyrhachis (leaf-rhachis broad). Bail. Ql. Jr/ri. Journ. iii. 

 356. Seems not to form stems above the ground ; the underground stem oval, 

 resembling a somewhat large Swede turnip, about 1ft. long with a circumference 

 of 2 feet near the centre, smoothly imbricated by the thin bases of former leaves. 

 Leaves probably about 12 in the crown, glabrous or when young very thinly 

 pulverulent, falcate, about 8ft. long of which the petiole occupies about 6 or Sin. ; 

 no woolly substance at their base. Petiole and rhachis flat on the upper, 

 <30nvexed on the underside, the broadest part about G lines. Pinnas or segments 

 iattached along the thin edge of the rhachis, and slightly decurrent without any 

 callosity, about 23 on each side of the rhachis, the lowest ones often the longer, 

 measuring about 15in. long and fin. wide, very coriaceous, curved, erect ; 

 longitudinal nerves numerous and prominent ; apex obtusely acuminate. Scapes 

 ■8 on the only plant (male) to hand, 6 to 9in. high, bearing cylindrical cones 3 to 4in. 

 long, lin. diameter. Scales triangular at the top, terminating in erect slender 

 ■spines of about 5 lines. Female cone (only one received) 6Jin. long, oblong, 

 iurgid, IJin. across the top ;. spine erect, flat, narrowing to a sharp point, those 



