110 TAXONOMY OF VASCULAR PLANTS [BoT. Absts., Vol. VIII, 



nated as A and B. Four points are given special attention: Form of the lip, its color, spots 

 on the leaves, and dwarf habit. These are discussed in relation to various closely related 

 species, as 0. salina Turcz., 0. cruenta MiilL, 0. Fuchsii Druce, 0. ericetorum Linton, 0. 

 praetermissa var. pulchella Druce, 0. latifolia L., and 0. incarnata, with the conclusion that 

 0. purpurella is a valid species, differing from the above species by the characters given. 

 The form B is closely related to 0. cruenta but can scarcely be referred to it, neither is it a dwarf 

 form of 0. latifolia. Hybrids of 0. purpurella with a dwarf form of 0. latifolia and with 

 O. ericetoru7n are noted. The forms described may have arisen by crossings of 0. incarnata 

 or 0. praetermissa with 0. latifolia or 0. maciilata, but the theory is favored that they are 

 mutations from 0. incarnata. — K. M. Wiegand. 



746. Stephenson, T., and T. A. Stephenson. The genus Epipactis in Britain. Jour. 

 Botany 58: 209-213. PL 555. 1920.— A critical study of Epipactis and Orchis extending over 

 several years resulted in a paper too large to publish as a whole. The present article contains 

 the important conclusions with respect to Epipactis. Five species are recognized for Britain: 

 E. palustris Crantz, E. atropurpurea Raf., E. viridiflora Rchb., E. purpurata Sm., and E. 

 latifolia Allm. The distinguishing features between the species are noted and discussed. 

 E. latifolia should include E. media Fries and E. atroviridis Linton. The conclusion is 

 reached that lip-bosses and details of leaf-scheme on which the last two species' names were 

 founded are very unstable and of no value as specific characters. These two names should 

 be dropped. It is not believed that E. media and E. atroviridis are hybrids, as they do not 

 behave like other hybrids with which the authors are acquainted.— i?. M. Wiegand. 



747. Stephenson, T., and T. A. Stephenson. The British palmate orchids. Jour. 

 Botany 58: 257-262. 1 pi. 1920.— This is a summary of several years' work on the marsh and 

 spotted orchids. Notwithstanding the great number of forms which more or less intergrade, 

 certain "landmarks" or species and certain hybrids may be recognized. The British palmate 

 orchids comprise the following species: Orchis incarnata L., 0. purpxirella Stephenson, 0. 

 ericetorum Linton, O. praetermissa Druce, O. latifolia L., and 0. Fuchsii Druce. Tha charac- 

 teristics of each of these is discussed, and reasons given for the belief that they are true species. 

 The colored plate which serves to illustrate previous papers by these authors as well as papers 

 to follow, is discussed in detail, and the differences between the species and peculiarities of 

 the hybrids as they appear in the plate are pointed out. — K. M. Wiegand. 



748. SvENSON, H. K. A northeastern variety of Panicum. Rhodora 22: 153-155. 5 fig. 

 1920.— The author describes Panicum dichotomifiorum Michx. var. puritanorum, n. var., from 

 Massachusetts. — James P. Poole. 



749. Swingle, Walter T. A new species of Pistacia native to southwestern Texas, P. 

 texana. Jour. Arnold Arboretum 2: 105-110. 1920.— The Pistacia of southwestern Texas 

 and northern Mexico formerly included under P. 7nexicana HBK. is described as a new 

 species, P. texana. — Alfred Rehder. 



750. Vicioso, Carlos. Una especie nueva del genero Gypsophila. [A new species of 

 the genus Gypsophila.] Bol. R. Soc. Espanola Hist. Nat. 19: 493-494. 1919.— Gypsophila 

 Ceballosi Pau & C. Vic, collected in Escorial, central Spain.— 0. E. Jennings. 



751. ViscHER, W. Sur les Quararibea Aubl. un genre de Bombacees a ovaire infere. [Con- 

 cerning the species of Quararibea Aubl. a genus of the family Borabacaceae with inferior ovaries.] 

 Bull. Soc. Bot. Geneve 11: 199-210. 5 fig. 1919.— The characteristics of the various types of 

 flowers of the genus Quararibea are given. A number of new combinations are introduced 

 and a new species, Quararibea Chodati Vischer, is described.— PF. H. Emig. 



