1903] Fernald, — Arabis Drummondi and its Relatives 229 
Edinburgh from Rocky Mountain seed collected by Drummond, was 
a plant with “foliis omnibus glabris, subintegerrimis, radicalibus in 
petiolam attenuatis, caulinis amplexicaulibus, sagittatis; siliquis 
strictissimis, pedicello stricto, glabro, quadruplo longioribus," and 
further, with leaves “at the root attenuated into petioles as long as 
themselves, both the leaf and petiole being ciliated with minute 
reflected hairs." ! 
A “rubbing” from the Drummond plant is in the Gray Herbarium 
and in the letter accompanying it Mr. Daniel Oliver wrote from Kew 
to Dr. Gray, under date of April 17, 1866: “I have been looking this 
afternoon at our specimens of Zurritis stricta with a view to the settle- 
ment of the question put in yours of the 2nd inst. I enclose a * rub- 
bing' from the fruiting branch of Drummond's Rocky Mountain 
specimen. This plant agrees entirely with Bourgeau's plant sent out 
— apparently through mistake — under the name Z. patula, Grah. 
(Rocky Mountains — Alpine region — 18 Augt., 1858), excepting 
that the petals of Drummond's plant are, in its present state, white, 
while in the Bourgeau plant they are tinged with purple." 
The Drummond plant and the Bourgeau specimen identified by 
Mr. Oliver with it and labelled by Dr. Gray Arabis Drummondi are 
the narrow-podded plant (in the Drummond specimen pods 5.3-6 
cm. long, 1.6—2.3 mm. broad; in the Bourgeau specimen 7 cm. long, 
2 mm. broad) represented by many western plants (for example, 
Wolf & Rothrock’s nos. 657, 658, 660 from Colorado; Baker, Earle 
and Tracy's no. 128 from Colorado; C. F. Baker's no. 48 — Arabis 
oxyphylla, Greene — from Colorado; Henderson's no. 2396 from 
Mt. Adams, Washington; and M. E. Jones's no. 1177 from Utah) 
and by most of the so-called A. confinis of the East. That the two 
plants are identical in habit, foliage, pods and seeds, and the occa- 
sional presence upon the basal leaves of malpighiaceous hairs, and 
only rarely of 3-rayed hairs like those of A. brachycarpa, is very 
apparent from examination of a large suite of specimens; and in view 
of these identities of characters and the lack of any apparent points 
of difference there seems no reason to separate from 4. Drummondi 
the strict plant which in the East has passed as A. confinis. 
The large plant with broad pods, found at Riviére du Loup and 
referred to in the introduction to these notes, differs from Arabis 
! Graham, Edinb. New Phil. Jour. 1829, 350. 
