1905] Fernald & Knowlton,— Darba incana and its Allies — 67 
asis Island, June 12, 1886 (7. E. Wetmore): VERMONT, Willoughby 
Mt., July 28, 1885 (W. Deane). — This is Arabis petraea of Fowler's 
List of Plants of New Brunswick (Nat. Hist. Soc. N. B. Bull. no. 
4, 15, 1885), and it is possibly D. glabella, Pursh, referred to D. 
arabisans by Torrey & Gray, and others. One individual from 
Tracadigash Mt. has the siliques acutely triquetrous, with three 
valves and two false partitions. 
Var. canadensis, n. comb. (Fig. 12.) Low, 1-1.5 dm. high: 
siliques elliptic-ovate, 5-7 mm. long, 3-4 mm. broad. WD. canadensis, 
Brunet, Cat. Plantes Can. 21 (1865).— QuEBEC, crevices of rocks, St. 
Joachim, Cap Tourmente, 1864 (Ovide Brunet). 
++ ++ Seeds closely crowded, angulate. 
D. pycnosperma, n. sp. (Figs. 13-15.) Perennial; caudex 
freely branching: flowering stems, 1 to 30, mostly simple, 0.5-2.5 dm. 
high, loosely pilose: basal rosettes very numerous, their leaves 
cuneate-spatulate, sparingly dentate above the middle, o.7-3 cm. 
long, closely stellate-pubescent; cauline leaves 2 to 4, oblong, o.5—1.5 
cm. long: racemes short and loose, in maturity 1.5-8 cm. long; ped- 
icels slightly spreading, 2-6 mm. long, glabrate: siliques plump, 
compressed, oblong to short-ovoid, 2.5-6 mm. long, 1.5-2.5 mm. 
broad; style very short but definite: funiculus very short : seeds, 0.9 
—1.2 mm. long, closely crowded and overlapping, angulate.— QuE- 
BEC, Percé, crests of calcareous sea cliffs, Cap Blanc, Aug. 17, 
1904; Cap Barré, Aug. 16, 1904; limestone ledges, Le Coulé, Aug. 17, 
1904 (Collins, Fernald & Pease). 
GRAY HERBARIUM. 
EXPLANATION OF PLATE 60.— Draba incana; fig. 1, small plant, life- 
size; fig. 2, silique, with valve removed, X 4. D. stylaris; fig. 3, portion of 
base, life-size; fig. 4, tip of fruiting raceme, life-size; fig. 5, silique, with 
valve removed, X4. D. megasperma ; fig. 6, portion of base, life-size ; fig. 7, 
tip of fruiting raceme, life-size; fig. 8, silique, with valve removed, X 4. D. 
arabisans; fig. 9, portion of fruiting raceme, life-size. D. arabísans, var. 
orthocarpa; fig. 10, tip of fruiting raceme, life-size; fig. rr, silique, with 
valve removed, X4. D. arabtsans, var. canadensis; fig. 12, fruiting raceme, 
life-size. D. pycnosperma; fig. 13, portion of base, life-size; fig. 14, fruiting 
raceme, life-size; fig. 15, silique, with valve removed, X 4. 
