18 University of California Publications in Botany [Vol. 5 



Nicotiana glauca Graham 



N. glaiica is a tree tobacco, since it is a perennial and forms 

 a trunk of considerable height and girth. It has spread from 

 its original habitat into a considerable number of tropical and 

 warmer temperate countries. It is probably a native of central 

 South America. It is a common escape in Southern California 

 where it is thoroughly naturalized and commonly reaches a 

 height of ten or twelve feet. It grows fairly well in central Cali- 

 fornia too and has appeared in abundance in San Francisco in the 

 section burned over in 1906. The stem is woody and much 

 branched. The leaves are long petioled, ovate-lanceolate, glabrous 

 and glaucous. It is the most nearly glabrous Nicotiana we have 



5 



cultivated in the U. C. B. G. (No. 10). The flowers are pale 

 yellow, long tubular, slightly gibbous above and with the almost 

 pentagonal limb deepl,y concave. In flower, it comes nearest 

 to N. paniculata. W. J. Hooker has accurately figured and 



described it (1827, pi. 2837). Comes (1899, p. 27) has de- 

 scribed three varieties which I have not, as yet, been able to 

 distinguish. 



Nicotiana glutinosa L. 



This is one of the most peculiar of the annuals of the 

 section Rustica in its foliage and its flowers. It is a very robust 

 plant, as represented in the photograph reproduced in plate 21. 

 The leaves are broadly and deeply cordate and abruptly acumin- 

 ate. The whole plant is pubescent-villose and extremely glandu- 

 lar sticky. The racemes are long, circinate at the tip, and with 

 the flowers alternate in two ranks on the same side. The 

 flowers are unlike those of any Nicotiana in shape except those 

 of N. tomentosa. They are short cylindrical below, suddenly 

 swollen above, where they open out in an irregular obliquely one- 

 sided funnel. The limb is fairly bilabiate, the stigma and 

 anthers being connivent just under the middle lobe of the upper 

 lip. The color is light yellow tinged with deep red. The flowers 

 easilv fall especially when there is a drop in temperature. 



79. 



Under No. 07 it has been cultivated in the U. C. B. 6., in the 



