202 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Vic. San Fran. 249; Greene, Fl. Fran. 1: 65 ; Erythea, 1: 82; Man. Bay Reg. 115; 

 Rattan, Key W. Coast Bot. 51 ; K. Brandegee, Zoe, 2 : 349 ; T. S. Brandegee, Zoe. 4 : 

 205 ; Davidson, Erythea, 2 : 30. 



PotentWa Oregana Nutt.; Torr. & Gr. Fl. N. Am. 1: 446. As synonym. 1840. 



Illustrations : Lehm. Rev. Pot. pi. 19. Plate 108. 



Stem tall, 4-8 dm. high, striate, leafy, branched, glandular or viscid, villous. Lower 

 stipules ovate-lanceolate, the upper ovate, small, 3-10 mm. long, generally entire. 

 Basal leaves with petioles 2-10 cm. long, sparinglyhairy, pinnate; leaflets 3 or 4 pairs, 

 obovate or nearly orbicular, the upper inclined to be somewhat rhomboid and often 5-6 

 cm. long, all more or less doubly serrate. Stem leaves short-petioled and with fewer leaf- 

 lets, which, however, are not much reduced in size, the upper ones only trifoliolate and often 

 opposite. Cyme open, generally dichotomously branched with a short-pedicelled flower 

 in the angle. Pedicels always short, or scarcely any. Hypanthium glandular-hirsute, 

 enlarged in fruit. Bractlets linear-oblong, acute, shorter than the sepals, which are oval, 

 abruptly contracted into a mucronate tip, more reticulate-veiny and thinner than in D. 

 glandidosa. Petals pale yellow, obovate, about the length of the calyx. 



This species most resembles D. glandidosa, but differs by the larger, more decidedly 

 double-serrate leaflets, the more leafy cyme, which is dichotomously branched, with a 

 short-pedicelled flower in the forks, but principally by the sepals, which are more veiny, 

 oval (not ovate-lanceolate), and abruptly contracted into a small tip, almost mucro- 

 nate.^ The common form is inclined to become glabrate. Lindley's figure of P. glatv- 

 dulosa incisa in Bot. Reg. 23 : pi. 1973, resembles this species as to the leaves, but the 

 cyme and the sepals are those of D. glandidosa. D. Wrangelliana is common in California 

 and Oregon, extending into Washington. 



P. Oregana Nutt. Mss., is a form of this species, but the stem is glandular and very 

 pubescent with long villous hairs. Torr. & Gray, Fl. N. Am. 1: 446, place it as a syno- 

 nym of P. glandidosa, but its habit and sepals show a close relationship with D. Wrangel- 

 liana. Specimens seen : 



California : Many collectors. 



Oregon: Douglas, 1822; Nuttall; Tolmie; E. Hall, No. 134, 1871; T. Howell, No. 

 109, 1877. 



Washington: C. V. Piper, No. 78, 1888; Wilkes' Exp.; W. H. Suksdorf, No. 2209, 

 1893; No. 1761, 1861. 



Idaho: A. A. & Gertrude Heller, No. 3130, 1896. 



1 As at least one specimen of Douglas' collection belongs to this species, it might be taken for P. glandulosa Lindley, de- 

 scribed from specimens from the same collector, but Lindley's figure shows that P. glandulosa is the plant with lanceolate sepals. 



