Part 28 (2/2)

[*] _Perennial from creeping or subterranean shoots; flowers rather large, yellow._

N. SYLVeSTRE, R. Br. (YELLOW CRESS.) Stems ascending; _leaves pinnately parted_, the divisions toothed or cut, lanceolate or linear; pods ('

long) on slender pedicels, linear and narrow, bringing the seeds into one row; _style very short_.--Wet meadows, Ma.s.s. to Va.; rare. (Nat.

from Eu.)

1. N. sinuatum, Nutt. Stems low, diffuse; _leaves pinnately cleft_, the short lobes nearly entire, linear-oblong; pods linear-oblong (4--6”

long), on slender pedicels; _style slender_.--Banks of the Mississippi and westward. June.

[*][*] _Annual or biennial, rarely perennial (?), with simple fibrous roots; flowers small or minute, greenish or yellowish; leaves somewhat lyrate._

2. N. sessiliflrum, Nutt. Stems erect, rather simple; _leaves obtusely incised_ or toothed, obovate or oblong; _flowers minute, nearly sessile_; pods elongated-oblong (5--6” long), thick; style very short.--W. Ill. to E. Kan., Tenn., and southward. April--June.

3. N. obtusum, Nutt. Stems much branched, diffusely spreading; _leaves pinnately parted or divided_, the divisions roundish and obtusely toothed or repand; _flowers minute, short-pedicelled; pods longer than the pedicels_, varying from linear-oblong to short-oval; style short.--With n. 1 and 2.

4. N. pal.u.s.tre, DC. (MARSH CRESS.) Stem erect; _leaves pinnately cleft or parted_, or the upper laciniate; the lobes oblong, cut-toothed; _pedicels about as long as the small flowers and mostly longer than_ the oblong, ellipsoid, or ovoid _pods_; style short.--Wet places or in shallow water; common. June--Sept.--Flowers only 1--1” long. Stems 1--3 high.--The typical form with oblong pods is rare. Short pods and hirsute stems and leaves are common. Var. HiSPIDUM is a form with ovoid or globular pods. (Eu.)

-- 3. _Petals white, much longer than the calyx; pods ovoid or globular; leaves undivided, or the lower ones pinnatifid; root perennial._

5. N. lacustre, Gray. (LAKE CRESS.) Aquatic; immersed leaves 1--3-pinnately dissected into numerous capillary divisions; emersed leaves oblong, entire, serrate, or pinnatifid; pedicels widely spreading; _pods ovoid, 1-celled, a little longer than the style_.--Lakes and rivers, N. E. New York to N. J., Minn., and southwestward. July--Aug.--Near N. amphibium.

N. ARMORaCIA, Fries. (HORSERADISH.) Root-leaves very large, oblong, crenate, rarely pinnatifid, those of the stem lanceolate; fruiting pedicels ascending; _pods globular_ (seldom formed); _style very short_.

(Cochlearia Armoracia, _L._)--Roots large and long; a well-known condiment. Escaped from cultivation into moist ground. (Adv. from Eu.)

12. BARBAReA, R. Br. WINTER CRESS.

Pod linear, terete or somewhat 4-sided, the valves being keeled by a mid-nerve. Seeds in a single row in each cell, marginless. Cotyledons acc.u.mbent.--Mostly biennials, resembling Nasturtium; flowers yellow.

(Anciently called the Herb of St. Barbara.)

1. B. vulgaris, R. Br. (COMMON WINTER CRESS. YELLOW ROCKET.) Smooth; lower leaves lyrate, the terminal division round and usually large, the lateral 1--4 pairs or rarely wanting; upper leaves obovate, cut-toothed, or pinnatifid at the base; pods erect or slightly spreading; or in var.

STRICTA, appressed; in var. ARCUaTA, ascending on spreading pedicels.--Low grounds and roadsides; apparently introduced, but indigenous from L. Superior northward and westward. (Eu.)

B. PRae'c.o.x, R. Br. (EARLY WINTER C.), with 5--8 pairs of lateral lobes to the leaves, and longer pods on very thick pedicels,--yet probably only a variety of the other,--somewhat cultivated from N. Y. southward as a winter salad, under the name of SCURVY-GRa.s.s,--is beginning to run wild.

(Eu.)

13. HeSPERIS, Tourn. ROCKET.

Pod linear, nearly cylindrical; stigma lobed, erect. Seeds in 1 row in each cell, oblong, marginless. Cotyledons inc.u.mbent.--Biennial or perennial, with serrate sessile or petiolate leaves, and large purple flowers. (Name from ?sp??a, evening, from the evening fragrance of the flowers.)

H. MATRONaLIS, L. (DAME'S VIOLET.) Tall; leaves lanceolate, ac.u.minate, mostly petiolate; pods 2--4' long, spreading.--Sparingly naturalized.

(Nat. from Eu.)

14. ERSIMUM, Tourn. TREACLE MUSTARD.

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