1907] 



BRIEFER ARTICLES 



Z<^Z 



Type, Stiksdor} 5860 m Herb. Gray, low sandy river bank, Bingen, W. Klicki- 

 tat County, Washington, 20 Aug. 1906. Other specimens which may be placed 

 here are /. S, Cotton 620^ sandy banks of river, Prosser, Yakima County, Wash- 

 ington, and ( ?) L. N. Gooding 2^1, river sand-bar, Middle Fork of Powder River, 

 Johnson County, Wyoming. These were both distributed as Onagra strigosa 

 Rydb., a clearly distinct species of which there is a cotype in the Gray Herbarium. 



The strongest diagnostic features of the two plants are as follows : 



Oenothera strigosa 



Oenothera cheradophila 



Bracts twice or thrice as long as the Bracts almost always considerably 



mature capsule, obtuse at base. 

 Flower bud and hypanthium ochra- 



shorter than the mature capsule, 

 acute at base. 



ceo-vinaceous, with sparse spread- Flower bud and hypanthium green- 

 ing pubescence. ish yellow, pubescence more 



dense. 

 Free tips of calyx segments (in bud) Free tips of calyx segments (in bud) 



3 



mm 



long. Petals 1.5-2 



cm 



long. 



less than i^^ long. Petals 8^^ 



Color light yellow, fugaceous in longor less. Color greenish yellow, 



■^^ilting. 

 Stamens shorter than the corolla. 



intense, persistent after wilting. 

 Stamens usually slightly longer than 



the corolla. 

 Stigma a little exceeding the stamens, Stigma usually reaching only to end 



lobes flattish, spreading. 



of filaments, teretish, ascending. 



In the case of both species the measurements were made from typical 

 flowers of type material. At the end of the inflorescence, or on weak 

 lateral branches, both O. strigosa and O. cheradophila often bear flowers 

 w^hich are greatly reduced in size and in which the petals are disproportion- 

 ately small. In such flow^ers of the former species, the stamens are likely 

 to be longer than the petals. 



It is worthy of note that very little of the material which western collect- 

 ors have distributed as Onagra strigosa Rydb. matches the plant from Pony,' 

 Montana, which Rydberg designated as the type of his species. 



Lewisia pygmaea (Gray) Rob., var. aridorum Bartlctt, var. nov,, 

 caudice foliisque radicaUbus eis formae typicae similibus; scapis breviori- 

 bus robustioribus a foliis longe superatis. Bracteae lanceolatae margine 

 glandulis subatris longistipitatis praeditae. Pedicelli 1-3 quam bracteae 

 paulo, nunquam duplo, longiores. Sepala usque ad 5"^"^ longa late ovata 

 vel orbicularia margine denticulata, denticulis in glandulas longistipitatas 

 atras desinentibus. Petala (ut in forma t}^ica ex loco eodem) alba, anguste 

 oblonga quam sepala dimidio longiora apice etiam glandulas stipitatas 3-4 



y 



gerenta. Capsula turbinata atro-brunnea 4.5 



mm 



longa. 



