NOTES AND ABSTKACTS. 



551 



'Mariette,' ' Coreen,' and 'Evangeline,' in the second. On August 21 

 p. 409, the same writer describes 1 Elfrida Pearson ' (fig. p. 408). — H. B. D. 



Narcissus Poetaz. By Joseph Jacob (Garden, May 29, 1909, 

 p. 267). — A good description of this new section of Daffodils, with an 

 account of their origin and principal varieties. — H. B. D. 



New Plants from Guatemala. (Bot. Gaz. vol. xvlii, No. 4, pp. 253- 

 April 1909). — New species of the following genera are described by 

 Mr, John Donnell Smith, viz. : 



Magnolia, Marila, Leandra, Hoffmannia, Guettarda, Chomelia, 

 Satria, Gonolobus (2), Merinthopodium, Neo titer ckheimia (new genus 

 of Bignoniaceae) (2), Justicia, Buprechtion (2), Duphnopsis (Nordmannia), 

 Euphorbia (Alectoroctonum). The specimens were collected by H. von 

 Tuerckheim in 1907-1908. — G. F. S.-E. 



New Plants of Nevada and Arizona. (Bot. Gaz. vol. xML, No. 6, 

 June 1909, pp. 425-437). — Mr. Aven Nelson describes a number of new 

 species and varieties collected by Mr. Leslie N. Goodding in the deserts of 

 southern Nevada and Arizona. 



They include new species of Calochortus, Lesquerella, Linum, 

 Condalia, Mentzelia (2), Ghylisma, Lavauxia, Pachylophus, Quincula, 

 Phy salts, Gaillardia, Enceliopsis new genus (Helianthella), including 

 various Encelias and a new species, Chaenactis, Dysodia (2), and various 

 new names of Dysodia spp. put under Hebetina. 



A new species of Euphorbia from Colorado (Baker, Earle, and Tracy, 

 n. 23) is also described. — G. F. S.-E. 



Nicotiana, Parthenogenesis in. By Mrs. R. Haig Thomas 

 (Mendel Jour. pp. 5-10 ; Oct. 1909). — The authoress shows that certain 

 species of Nicotiana are capable of producing seed without fertilization. 

 N. suaveolens from Australia, N. sylvestris, N. Tabaccum vars. as well 

 as several allied hybrids, behave in this way. It is suggested that since 

 N. Sanderae breeds true from seed it was produced by selection 

 from parthenogenetic seedlings of the alleged seed parent, N. Forgetiana. 

 If it had been the result of a cross between N. Forgetiana and N. affinis 

 the authoress suggests that it ought to segregate and throw seedlings of 

 various kinds, but it is also possible that it is because seed is produced 

 parthenogenetically that the plant breeds true (and it is shown that it 

 does produce seed without fertilization). — F. J. G. 



Nototriche. A Revision of the Genus. By A. W. Hill, M.A. 

 (Trans. Linn. Soc. Bot. Vol. vii. Part 12, pp. 201-266 ; 1909. Plates 

 27-30 and text fig.). — It is impossible to mention here the wealth of in- 

 teresting details contained in the paper, but reference may be made to the 

 light which Mr. Hill believes these plants throw on the origin of new 

 species by mutation. The species of the genus Nototriche exhibit such 

 a diversity in leaf -form, in distribution and character of tomentum, etc., 

 that it is difficult to suppose that all these many variations in form have 

 an adaptive significance. When we find several species exhibiting a 

 number of distinct modifications in their form growing in close association 



