26 University of California Publications in Botany [Vol. 5 



tapering towards the base, although, in some plants, some of 

 the leaves are truncate at the base and partly clasping. The 

 capsule is large and two- or three-celled. It generally grows 

 in sandy banks or bottoms of rivers, overflowed in spring, but 

 dry in summer. There are several variations of the type upon 



40 



which it is hoped to report later. U. C. B. G. 05 represents 



60 



such a plant, while U. C. B. G. 07 a, represents a lower, spread- 

 ing plant which may possibly be nearer the strict taxonomic 

 type. The figures given by Watson (1871, pi. 26, fig. 3, 4) in the 

 Eeport of the Botany of King's Expedition resemble U. C. 



60 

 B. G. 07 a, more nearly than any other and the type (or cotype) 



in the Gray Herbarium of Harvard University seems to be the 



same. These plants are the more common in central California. 



A r . Bigelovii var. Wallacei Gray is a slender plant, with slender, 



narrower corolla, with elongated deltoid leaves. This is the 



43. 

 more abundant form in Southern California. U. C. B. G. 05 



represents this type. 



Nicotiana quadrivalvis Pursh. 



Nicotiana quadrivalvis seems to be a lost species in nature. 

 It was described by Pursh (1814, pp. 141, 142) from the plants 

 collected by Lewis and Clark in their expedition across the con- 

 tinent. Lewis and Clark got their plants from the Ricaree 

 Indians who cultivated it. The type-specimen is still preserved 

 in the Herbarium of the Academy of Natural Sciences at Phila- 

 delphia, where I have had the opportunity of examining it 

 through the courtesy of Mr. Stewardson Brown. It seems ex- 

 actly like the plants developed in the U. C. B. G. and somewhat 

 unlike the plants grown in the past in various botanical gardens. 

 It was introduced into gardens in 1811 (cf. Don, 1838, p. 466) 

 and was figured by Sims (1816, p. 1778). Lehmann (1818, p. 

 45, pi. 4) also described and figured it. How long it persisted 

 in botanical gardens is not certain, but it seems to have been 

 extensively cultivated, judging from herbarium specimens. It is 

 still offered in some seed-lists, but seed obtained from such lists 

 have given me only varieties of N. Tabacum or A T . rustica. 



