On the Julianiacece, a New Natural Order of Plants. 231 



EXPLANATION OF DIAGEAM, PLATE 11. 



On the plate are given details of four families of parthenogenetie ? 's. Fam. 1 

 contains a few arrenotokous <j> 's, Fam. 2 contains many, whilst Fam. 3 and Fam. 4 

 show none (cf. Types B, A, aDd C, pp. 226, 227). T denotes a ? proved to be thelytokous. 

 A denotes a ? proved to be arrenotokous. The small figures in Families 3 and 4 

 signify the number of the generation from the original parent of the strain. Thus in 

 Family 3, T 9 + 12T means that in the ninth generation 13 $ 's from the same parent 

 (T 8 ) were proved to be thelytokous, and that one of these was used as the mother of 

 the tenth generation — the rest being discarded. Where apparent gaps occur, e.g., in 

 Fam. 3, between T 17 and T 40 , it means that a single ? was used in each generation to 

 continue the strain, but that the sisters of these individuals were not bred from. 



On the Julianiacece, a New Natural Order of Plants. 



By W. Botting Hemsley, F.B.S., F.L.S., Keeper of the Herbarium and 

 Library, Boyal Botanic Gardens, Kew. 



(Received June 6, — Read June 28, 1906.) 



(Abstract.) 

 I. — General Description. 



The Julianiacese comprise, so far as at present known, two genera and five 

 species. They are resiniferous, tortuously branched, deciduous, dioecious 

 shrubs or small trees, having alternate, exstipulate, imparipinnate leaves, 

 from about one to three decimetres long, clustered at the tips of the flowering 

 branches and scattered along the short barren shoots. The flowers are small, 

 green or yellow-green, quite inconspicuous, and the males are very different 

 from the females. The male inflorescence is a more or less densely branched 

 axillary panicle or compound catkin, from 2\ to 15 cm. long, with weak, 

 thread-like, hairy branches and pedicels. The male flowers are numerous, 

 3 to 5 mm. in diameter and consist of a simple, very thin perianth, divided 

 nearly to the base into four to nine narrow equal segments, and an equal 

 number of stamens alternating with the segments. In structure and 

 appearance they are almost exactly like those of the common oak. The 

 female inflorescence is similar in structure to that of the sweet chestnut, 

 consisting of an almost closed, usually five-toothed involucre, borne on a 

 flattened pedicel and containing three or four collateral flowers, of which the 

 two outside ones are, perhaps, always abortive. 



At the flowering stage, the female inflorescences, including the narrow 



