

Cruciferaceae 19] 
the top. (Gk. eryein=to draw blisters: a property of the ground seeds of many of 
plants of this family.) 
A. Petals 4—5 mm. long; pod 1—2 cm. long. E. (C. turretoides.) 
E. cheiranthoides L. (Treacle Mustard) 
AA. Petals 6—25 mm. long (unknown in E. arenicola) ; pod 2.5—10 cm. long. 
B. Pod terete or 4-angled. 
C. Petals 6—10 mm. long; pod 2.5—-5 cm. long. E. (C. inconspicuus.) 
E. parviflorum Nutt. (Small Wall-flower) 
CC. Petals 12—25 mm. long; pod 5—12.5 cm. long. 
D. Seed 4-angled. W.C.E. (C. capitatus. ) 
E. asperum DC. 
DD. Seed lens-shaped. C. E. 
E. elatum Nutt. 
BB. Pod flattened parallel to the partition. 
E. _ Biennial; stems simple, not caespitose. W. 
E. arenicola Wats. 
EE. Perennial; stems branched, caespitose. E. 
E. occidentale Rob. 
LOBULARIA 
Herbs (ours) or shrubs, perennial, pubescent or canescent with forked hairs. Leaves 
entire. Flowers small, white, in terminal racemes. Petals obovate, entire. Filaments 
slender, not toothed, but with 2 small glands at the base. Pod compressed, oval or or- 
bicular; cells |-seeded. (L. lobulus—a little lobe; probably referring to the 2-lobed 
hairs. ) W. L. maritima Desv. (Sweet Alyssum) 
ALYSSUM 
Annual or perennial, low, branching, stellate-pubescent. Flowers small, yellow or 
yellowish, in racemes. Petals entire. Filaments often dilated and toothed or appendaged. 
Stigma nearly entire. Pod ovate, oblong to orbicular (ours), compressed; valves vein- 
less; partition thin. Seeds |—8 in each cell of the pod (2 in ours), wingless. (Gk. 
a—against, lyssa—madness; one was once reputed a remedy for hydrophobia.) W. E. 
(Psilonema calycinum. ) A. alyssoides Gouan (Yellow Alyssum) 
BRAYA 
Perennial, from a thickish root topped by a multicipital caudex. Leaves mostly 
basal, entire or merely dentate. Flowers in ours white or purplish, in a spherical head. 
Petals exserted, entire, short-clawed. Style short, persistent; stigma more or less dis- 
tinctly 2-lobed. Pod oblong to linear-oblong (ours) ; valves convex or somewhat flat, not 
keeled, faintly |-veined. Seeds in 2 rows in each cell. (Honor of F. G. DeBray, a 
French count.) C. (Sisymbrium perplexum.) 
B. humilis Rob. (Low Rock-cress) 
PARRYA 
Perennial, low. Leaves mostly basal, somewhat fleshy, entire or toothed. Flowers 
rose or purple. Sepals equal or the lateral ones saccate at base. Petals spatulate, 
clawed. Style short; stigma 2-lobed. Pod compressed, 2.5—-5 cm. long in ours; 
valves plane, |-veined. Seeds in |—2 rows in each cell, large, somewhat flat, orbicular. 
(Honor of W. E. Parry, an English explorer.) E. (2. menziesii lanuginosa.) 
F, menziesii &r. 
