ABSTRACTS. 



571 



Petunia superbissima Varieties. By Ed. Michel (Rev. Hort. 

 p. 350; August 1901). — Large wide-throated flowers ; tall hahit. Recom- 

 mended for pot culture or on trellis. — C. T. D. 



Phaius tuberculosus. By R. A. Rolfe {OrcJi. Rev. p. 41, Feb. 1901). 



— The distinction between the species which has been grown for so many 

 years in gardens as P. tuberculosus (now transferred to P. simulans) and 

 the original variety described by M. Thouars. The conditions also under 

 which it was found growing by M. Warpur in Madagascar are also referred 

 to.— iJ. /. C. 



Philippia keniensis. By Spencer Le M. Moore {Journ. Bot. 464, 

 p. 259 ; 8/1901). — Description of a new species from Mount Kenia. 



G. S. B. 



Philodendron crassum. By A. B. Rendle (Joum. Bot. 464, p. 

 277; 8/1901). — Description of a new species, near P. cannce folium, 

 flowered by Mr. A. H. Smee at Hackbridge, Surrey, and received by him 

 from Rio de Janeiro. — G. S. B. 



Phytography, a Contribution to the Clearing- up of some 



Ideas in. By F. Krasan (Engl. Bot. Jahrb. xxxi., Beibl. 69, pp. 3-38 ; 

 16/8/1901). — A discussion of the question of the limitation of species, 

 varieties, &c. — A.B.R. 



Pieris Brassicse, Natural Enemies and Artificial Remedies 



for {U.S.A. Exp. Stn. Record, vol. xiii. No. 2, 1901 ; p. 159).— In regard 

 to attacks and ravages by this species, it is recommended that the destroy- 

 ing of eggs should be placed first. This is considered quite practicable, 

 as they are a bright yellow, and are deposited in groups of considerable 

 size. Experiments with various chemicals were conducted, but in many 

 cases little eflect was observed. A potash soap solution of 1^ to 2 J per 

 cent, strength, quickly destroyed caterpillars without injury to plants. 

 The relative importance of insects parasitic on the species is noted. 



E. F. H. 



Pineapples, diseased. By Prof. Webber {Bull. Bot. Dep. Jam. 

 vol. viii. p. 83). — The fungus attacks the root, but no remedy is efl'ective. 

 Only eradication of the diseased plants, and selection to secure a disease- 

 proof race, if possible. — G. H. 



Piper nig'rum. By E. Henze {Die Gart. p. 583-584 ; 7/9 1901).— 

 This well-known plant is flowering in the Orchid-house of the Friedrich 

 Wilhelm Garden in Magdeburg. — G. R. 



Planes. By W. J. Bean {Gard. Chron. No. 754, p. 363 ; 8/6 1901).— 

 A brief review of this genus of trees is given, in which the names of the 

 different species and the way in which they vary from one another are 

 detailed. See also a note on page 369 of a paper by M. F. Jaennicke on 

 planes in the " Botanisches Centralblatt," 8/1901. — G. S. S. 



Plants in Rooms. By Garten-Inspector Weidlich {Gartcnflora. 

 p. 281; 1/6/1901). — Useful and concise remarks on the care and 



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