1909] DE VRIES— TRIPLE HYBRIDS 3 



* 



guished from them externally, even when cultivated in large and pure 

 lots. 



0. Hookeri T. and G. is a Californian species and is also found in 

 Texas. 3 I collected seeds in the vicinity of Berkeley, California, and 

 another lot was sent to me from Riverside by Mr. Fred M. Reed. 

 It is a striking species, even more beautiful than O. Lamarckiana. 

 The flowers are of the same size, protruding their pistils high above 

 the anthers: but the netals are 



more 



nearly obcordate, and a paler yellow. The plant is hairy and reddish, 

 and the leaves (especially those of the rosette) are long and narrow. 



With Lamarckiana it produces twins identical in both reciprocal 

 crosses and both of them as large-flowered as the parent species. 

 The laeta is bright green, with smooth leaves and slender flower buds. 

 The velutina is hairy and reddish, with furrow-shaped leaves and thick 

 buds. It flowers more profusely and resembles O. Hookeri almost 

 exactly, but is stouter, with dense and richly flowered spikes. 



Hooket 



from 



The American subspecies of O. biennis used for my experiments 



was collected by me in 1904 at Chicago, near Jackson Park. Tt seems 



to be the same form as that which is most common in the eastern 



-tates. Other subspecies I have collected in Pennsvlvania, Kansas, 

 Mis 



Europ 



souri, and elsewhere. All of them are quite different from the 



my 



m my article on twin hybrids (Bot. CxAzette I.e.). A systematic 



numerous 



b 



my 



call it Chicago. Its most curious duality is that of producing twins 



when 



male 



crossed with the pollen of this species. In this respect it is exactly 



and 



from 



and darker green than the European form. Its flowers are much 

 smaller, sometimes reaching the size of those of O. muricata, but 



Ho 



Grav R • and G - = "° na g ra Hookeri Small = 0. biennis hirsutissima 



UnJ'nT; CaHf ' See H - M - "all, A botanical survey of San Jacinto Mountain. 

 UniV - Cahf - Publ. Bot. x S9 8. I002 . 



