Cruciferaceae 189 

margined, much flattened, plano-convex, indehiscent, I-celled, |-seeded. Seed somewhat 
flat, margined. (Gk. thysanos—a fringe, karpos—fruit or body; referring to the wing- 
margined pod. ) 
A. Upper leaves lanceolate or linear-lanceolate; pod 4—-8 mm. wide, not radiately 
veined ; pedicels 48 mm. long. E. (T. curvipes madocarpus.) 
Ws curvipes Hook. (Fringed Lace-pod) 
AA. Upper leaves ovate-lanceolate or ovate-oblong: pod 8—10 mm. wide, radiately 
veined ; pedicels 8—17 mm. long. U. 
T. radians Benth. (Radiate Lace-pod) 
SMELOWSKIA 
Herbs but sometimes woody at base, perennial, low, caespitose; pubescence simple 
or stellate. Leaves |—2-pinnatifid. Flowers small, white, in terminal racemes. Petals 
entire, obovate or spatulate, longer than the sepals. Stigma sessile. Pod lanceolate or 
lance-oblong, more or less flattened at right angles to the partition; valves sharply keeled. 
Seeds few. (Evidently named after some Russian.) 
A. Capsule lanceolate, attenuate at each end; petals 11% times as long as the sepals. 
W.C.E. (S. americana.) §. calycina Mey. 
AA. Capsule ovate, obtuse to subcordate at base, acute to attenuate at apex; petals 
1% times as long as the sepals. W. C. . 
S. ovalis Jon. 
AAA. Capsule linear, obtuse at base, acuminate at apex; petals 3 times as long as the 
sepals. U. S. fremontii Wats. 
ARABIS ROCK-CRESS 
Herbs but sometimes woody at base, annual or biennial or perennial, usually with 
stellate or forked pubescence. Leaves usually simple. Flowers white or purple, in bract- 
less racemes. Sepals equal or the lateral ones saccate at base. Petals entire or emar- 
ginate, usually clawed. Stigma simple or barely 2-lobed. Pod linear, flattened parallel 
to the partition; valves flat or sub-convex, |-veined; partition membranous. Seeds in 
1—2 rows in each cell, elliptic or orbicular, more or less margined or winged. (Named 
from Arabia, the country where first found. ) 
A. At least the upper stem-leaves wholly glabrous; basal leaves somewhat pubescent. 
B. Stem-leaves cordate or eared at base. 
C. Mature pods erect or nearly so. 
D. Flowers dark red to blackish; pod 7.5 cm. or more long. E. 
: A. atrorubens Gr. (Purple Rock-cress) 
DD. Flowers white to pink. 
E. Seeds in | row in each cell of the pod; flowers pinkish. 
F. Pods 3—4 cm. long, nearly straight; sepals glabrous. W .C. E. 
A. lyallii Wats. 
FF. Pods 5—10 cm. long, curved; sepals pubescent. C. E. (A. latifo- 
; lium). A. lemmoni Wats. 
: EE. Seeds in 2 rows in each cell of the pod; pods 5—8 cm. long. 
G. Stem hirsute at base; petals yellowish-white, hardly exceeding the se- 
: pals. W.C. E. (A. perfoliata.) 
j A. glabra Bernh. (Tower Mustard) 
GG. Stem glabrate at base; petals pink or white, twice as long as the 
sepals. W.C. E. 
A. drummondii Gray 

