Tas.. 7683: 
LEWISIA Twexpyt. 
Native of Washington Territory. 
Nat. Ord. PortTULACER. 
Genus Lewista, Pursh.; (Benth. & Hook. f. Gen. Plant. vol. i. p. 159.) 
Lewista (Oreobroma) Tweedyi; herba acaulis, glaberrima, multiflora, caudice 
brevissimo radiceque elongato carnuso, foliis omnibus radicalibus 
patenti-recurvis late ovatis obovatisve carnosulis apice rotundatis basi 
in petiolum crassum anguste alatum angustatis, supra saturate viridibus 
subtus pallidis, pedunculis foliis paullo longioribus 1- rarissime 2-floris 
eglandulosis hinc illinc bracteatis, floribus amplis, sepalis orbiculari- 
oblongis, petalis 8 14-2-pollicaribus sepalis quadruplo longioribus anguste 
obovato-oblongis obtusis, staminibus ad 20, filamentis basi pilosis, 
antheris parvis aureis, ovario oblongo, stylo gracili, stigmatibus 3 
brevibus recurvis, capsula polysperma basi circumscisse 3 valvi, valvis a 
basi ad apicem dehiscentibus, seminibus globosis granulatis, arillo laxo. 
L. Tweedyi, B. Robins. in A. Gray, Synopt. Fl. N. Am. vol. i. p. 268. 
Calandrinia Tweedyi, A. Gray, in Am. Acad. Arts § Sc. vol. xxii. (1887), 
p. 277. 
Oreobroma Tweedyi, Howell in Erythea, vol. i. p, 32 (1898). 
Owing to the difficulty of defining the limits of the 
closely allied genera Lewisia, Pursh, and Calandrinia, 
H. B. K., the plant here figured has by American 
authors been placed under both, and also referred to a 
separate genus, Oreobroma, Howell. I have here adopted 
Mr. B. Robinson’s view, who, after an examination of all 
the N. American species of the two genera, separates 
them according to the dehiscence of the capsule, which in 
Calandrinia dehisces from the apex to the base, and in 
Lewisia in the opposite direction. Oreobroma, the chief 
character of which is the fleshy roots (eaten by the Indians), 
he reduces to a section of Lewisia. 
The type of the genus Lewisia is L. rediviva, figured at 
tab. 5395 of this work. It differs greatly from L. Tweedyi 
in the leaves being cylindric, the bracts of the peduncles 
collected in a whorl, the very numerous petals, and the 
eight filiform style branches. 
L. Tweedyi is a native of the alpine region of the 
Wenatchee Mts. in Washington State, at an elevation of six 
thousand to seven thousand feet. The specimen figured 
January Ist, 1899, 
