2gi 



THE GENUS HCTINOSTROBUS. 



I. HISTORICAL. 



Miquel founded this Genus in Lehmann's " Plantse Preissianse " in 1848^ 

 on a densely branched shrub occurring in Western Australia. Since then another 

 species has been recorded, but both are endemic to that part of the Continent. 

 Although closely allied to Callitris, yet its imbricate bracts on the cone scale as well 

 as physical and other features, mark it as distinct from that genus. 



II. SYSTEMATIC. 



The leaves are homomorphic, in alternate ternary whorls of three, very 

 short, thick, rigid, acute, and like those of Callitris are characterised by a con- 

 crescent or decurrent portion. Flowers monoecious. Male amenta oblong ; micro- 

 sporophylls in whorls of three, and in six vertical columns; microsporangia 2-4. 

 Female amentum solitary, globular or acuminate ; macrosporophylls imbricate in 

 whorls of three, closely appressed, the innermost, bearing one or two macro- 

 sporangia at the base. 



Fruit cones on the end of short, thick, woody stalks, the innermost thickened 

 and subtended by closely appressed sterile scales. Seeds, three-winged, central 

 column mostly present. Vide Lubbock's " Seedlings," Vol. II, p. 549 (1892), 

 where it is stated this genus has three subulate cotyledons. 



1. Actinostrobus pyramidalis. 



Miq. in PI. Preiss. i. 644. 

 (Syn. : — Callitris actinostrobus, F.v.M., Rep. Burdek. Exp., 19.) 



Habitat. 

 Western Australia, King George's Sound, Baxter to Swan River (Preiss), 

 Murchison River (Oldfield). 



I. HISTORICAL. 



(Vide supra.) 



