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BOTANICAL GAZETTE 



of Godetia if G. biloba Wats, be left in the genus. This latter might 

 be transferred to Phaeostoma but for its bilobed petals, or to 

 Clarkia if judged by its aspect alone. The larger the series of 

 specimens and the more species included in the study, the more 

 probable it seems that unbroken series can be established running 

 through the three genera on the following characteristics : 



1. Stamens 4-8 and all alike or in two sets, the one gradually reduced in 

 size and finally to sterility and extinction. 



2. Petals from entire to deeply 2 or 3-lobed, and from sessile to long and 

 narrowly clawed. 



It would not seem unwise to reduce all three to one genus but for the 



Pachylophus psammophilus, n. sp. — Wholly glabrous through- 

 out, caulescent, branching near the base, usually 1 dm. or more 

 high: leaves lanceolate, entire or slightly repand, acutish, each 

 attenuate into a petiole with margins narrower than the midrib: 

 calyx tube only twice as long as the narrow acute segments : petals 

 white (drying pink), 2-3.5 cm. long: capsules sessile, narrowly 

 conical, somewhat curved and tapering gradually, 3-3.5 cm. long, 

 not at all tuberculate, slightly angled. 



Plants growing in sand dunes in the vicinity of St. Anthony, Idaho. Very 

 distinct in aspect and technical characters from its nearest relative, P. caes- 

 pitosus (Nutt.) Raimann, of South Dakota. 



PERIDERIDIA Reichb. Handb. 219. 1837; Meisn. Genera 

 1:150. 1837; Endl. Gen. PI. 792. 1838; Steudel, Norn. Bot. ed. 

 II. 2:304. 1841. —Eulophus Nutt. in DC. Coll. Mem. 5:69. 1829, 

 not Eulophus R. Br. in Bot. Reg. 573. 182 1, in the English text. 



Robert Brown in 182 1 published his new orchidaceous genus 

 Eulophus, and though he changed this to Eulophia in 1823, the 

 earlier form of the word must, of course, be used. This necessi- 

 tates, unfortunately, another name for the plants we have known 

 so well as Eulophus Nutt. It may be questioned if Reichenbach 

 really published his genus in his Handbuch; certainly he makes 

 no reference to a species, as stated in the Kew Index. The genus 

 is given good descriptions by the authorities cited above, however; 

 and Steudel publishes it with the species. The following new 

 combinations, together with the type, are noted. 



