278 F. Fedde und K. Schuster: Index novarum Siphonogamarum. [278 



Lavauxia taraxacoides Woot. et Standl. 1. c. p. 155. — New Mexico, Sacra - 



mento Mountains. 

 Oenothera irrigaa Woot. et Standl. 1. c. p. 155. — New Mexico, Farmington 



(Wooton n. 2732). 

 Oe. macrosiphon Woot. et Standl. 1. c. p. 155. — New Mexico, Organ Mountains 



(Wooton n. 114). 

 Oe. procera Woot. et Standl. 1. c. p. 156. — New Mexico, Pecos River National 



Forest (Standley n. 4212). 

 Oe. longissima Rydb. in Bull. Torr. Bot. Club XL (1913) p. 65. - Utah (Ryd- 



berg et Garrett n. 9410). 

 Oe. omata (A. Nels.) Rydb. 1. c. p. 66 ( = Onagra ornata A. Nels.). — Rocky 



Mountains. 

 Oe. hirsutissima (A. Gray) Rydb. 1. c. p. 66 (= Oe. biennis var. hirsutissima 



A. Gray). — Rocky Mountains. 

 Oe. subulifera (Rydb.) 1. c. p. 66 (= Onagra strigosa var. subulata Rydb. 



= Onagra Oakesiana Rydb., non Oenothera Oakesiana A. Gray). 



Rocky Mountains. 

 Oe. angustissima Gates in Rhodora XV (1913) p. 46. PI. 100. 101. Ithaca. 

 Oe. biennis var. sulphurea de Vries in litt. 1. c. p. 53. — Sand-dunes of 



Holland. 

 Oe. nutans Atkins. et Barth 1. c. p. 83. — Ithaca (Atkinson n. 2). 

 Oe. pycnocarpa Atkins. et Barth 1. c. p. 83. Ithaca (Atkinson n. 1). 

 Pachylophus aastralis Woot. et Standl. in Contrib. U. S. Nat. Herb. Washington 



XVI (1913) p. 156. - New Mexico. 

 P. eximius (A. Gray) Woot. et Standl. 1. c. p. 157 (= Oenothera eximia A. Gray 



= Pachylophus exiguus Rydb.). — New Mexico. 

 Sphaerostigma macrophyllum (Small) Rydb. in Bull. Torr. Bot. Club XL (1913) 



p. 66 (= Oenothera alyssoides var. villosa S. Wats. = Sphaerostigma 



alyssoides var. macrophyllum Small). — Rocky Mountains. 

 Xylonagra Donn. Smith et Rose gen. nov. in Contr. TJ. S. Nat. Herb. XVI 



(1913) p. 294. 



This genus differs from Hauya in its bushy habit and small 



leaves, in the character of the inflorescense, in its much sm aller flowers, 



differently shaped calyx tnbe, highly colored petals, short filaments, 



merely mucronate and not reticulate anthers, much smaller capsules 



of different texture with cells containing one row of few seeds instead 



of two rows of very numerous ones, and in the very small seeds with 



a different kind of wing. It has, moreover, a very different ränge and 



habitat. 

 X. arborea (Kellogg) Donn. Smith and Rose 1. c. p. 294 (= Oenothera arborea 



Kellogg = Hauya californica S. Wats. = H. arborea Curran). 



Lower California. Cedros Island (Anthony n. 46, Rose n. 16133, Nelson 



and Goldman n. 7157); San Bartolome Bay, Rosalia Bay (Anthony 



n. 46 a). 

 Xylopleurum multicaulc (Ruiz et Pav.) Loes. in Fedde, Rep. XII (1913) p. 237 



(= Oenothera multicaulis Ruiz et Pav. = Oe. cuprea Schlechtd.). — 



Mexiko (Pringle n. 4702); Guatemala (Donn. Smith n. 2149). 

 X. deserticolum Loes. 1. c. p. 238. Mexiko (Uhde n. 1222, Seier n. 5280 



et 5614. 5319). 



