106 



SHORTER NOTES 



/ Trichospira verticillata (L.) Blake, n. comb. — Bidens verticil- 

 lata L.! Sp. PI. 2: 833. 1753. Trichospira menthoides HBK. 

 Nov. Gen. 4: 28 t. 312. 1820. T. &iam/ato Less. Linnaea 4: 343. 

 1829. Rolandra septansWiWd. e^l^essA. c. as syn. Trichospira 

 Pulegium Mart, ex DC. Prod. 5: 91. 1836. T. Prieurei DC. 

 1. c. (1836).^ — ^This common composite of the American tropics, 

 from Vera Cruz to Brazil and Peru {Ruiz & Pavon, hb. Brit, 

 Mus.), has long been known as Trichospira menthoides HBK. 

 It is identical with Linnaeus's Bidens verticillata, based on the 

 Bidens no. 4 of the Hortus Cliffortianus (399 (1737)), which was 

 founded on specimens collected in Vera Cruz by Houston and 

 now in the British Museum, and the name of this monotype must 

 consequently be changed to the one given above. The achenial 

 characters relied on by Lessing and de Candolle in their separa- 

 tions seem, as long ago noted by Bentham in the Genera Plan- 

 tarum, to be of no consequence; the intermediate awns at the 

 apex of the achene, formed by the excurrent ribs of the achene 

 face, varying from none, to short deltoid teeth, or quite distinct 

 short-aristulae on the same plant. 



S. F. Blake 



London, England 



REVIEWS 



Bailey and Gilbert's Plant= Breeding-* 



Volumes with this title written solely by the senior author 

 have, during the past twenty years, passed through four editions 

 with several reprintings. The last edition appeared in 1906 with 

 the text in the form of six lectures. In the new edition this style 

 of presentation is only slightly modified, making the book a 

 popular treatise for the general reader and an elementary text 

 for the student of plant-breeding. 



One of the new chapters treats very excellently of the measure- 

 ment of variation. The former treatments of mutations and of 

 heredity have been expanded and treated in special chapters. 

 As in the previous volumes, there is a glossary of terms, a bibliog- 

 raphy, and, in addition, lists of books and periodicals treating 



* By L. H. Bailey, new revised edition by Arthur W. Gilbert. The Rural Science 

 Series. Published bj- the MacMillan Company, 1915. Price I2.00 net. 



