432 



CRUCrFERAE (MUSTARD FAMILY^) 



764. B. sinuata. 

 Leaves and part of 

 fruiting raceme x %. 



3. R. sinuata (Nutt.) Greene. Stems low, diffuse ; leaves pinnately cleft, 



the short lobes nearly entire, linear-oblong ; pods Unear-oblongr (6-10 mm. 



long), on slender pedicels ; style slender. (^Ifasttcrthim 



Nutt.; Boripa Hitohc.) — Banks of the Miss, and westw. 



June. Fig. 764. 



** Annual or biennial, rarely perennial (?), with simple 

 fihrons roots; flowers small or minute, greenish or 

 yellowish; leaves somewhat lyrate. 



4. R. sessiliflbra (Nutt.) Greene. Stems erect, rather 

 simple ; leaves obtusely iricised or toothed, obovate o^ 

 oblong ; flowers minute, nearly sessile ; pods elongate-oblong 

 (1-1.2 cm. long), thick; style very short. (Nasturtium 

 Nutt.; Boripa Hitch c) — Richmond, Va. {Churchill) to 

 Neb., e. Kan. and southw. Apr. -June. 



5. R. obtusa (Nutt.) Greene. Stems much branched, 

 diffusely spreading ; leaves pinnately parted or divided, the 

 divisions roundish and obtusely toothed or repand ; flowers 

 minute, short-pediceled ; pods longer than the pedicels, vary- 

 ing from linear-oblong to short-oval ; style short. (Nas- 

 turtium Nutt. ; Boripa Britton.) — Low ground, n. Mich. 

 ( Farwell) to Tex. and westw. 



Var. sphaerocirpa (Gray) Robinson. Pods globular, about equaling the 

 pedicels. (Nasturtium Gray; Boripa Britton.) — 111., and southwestw. 



6. R. paliistris (L.) Moench. (Maesii Ckisss.) Stem erect, 

 3-8 dm. high, mostly glabrous ; 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 short-cylindrio 

 ellipsoid or ovoid pods; style short. (Nastur- 

 tium DC. ; Boripa Bess. ) — Wet places or in 

 shallowwater; common. June-Sept. (Eurasia.) 

 Fig. 765. 



Var. hispida (Desv.) Robinson. Hirsute ; pods globose or nearly 

 so. (Boripa hispida Britton ; Nasturtium palustre, va.v. Gray.) 

 — With the type ; the commoner form east w. (Eurasia. ) Fig. 766. 



§3. Petals lohite, much longer than the calyx; pods ovoid or globular; leaver 

 undivided, or the lower ones pinnatifld ; root perennial. 



7. R. aquitica (Eat.) Robinson. (Lake Cress.) Aquatic ; immersed leaves 

 1-3-pinnately dissected into numerous capillary divisions ; emersed leaves oblong, 

 entire, serrate, or pinnatifld ; pedicels widely spreading ; pods ovoid, 1-relled, 

 a little longer than the style. (Boripa americana Britton ; Nasturtium lacustre 

 Gray.) — Lakes and rivers, w. Que. and n. Vt. to Minn, and southw. July- 

 Aug. 



8. R. ARMORiciA (L.) Robinson. (Horseradish.) Root-leaves very large, 

 oblong, crenate, rarely pinnatifld, those of the stem lanceolate ; fruiting pedicels 

 ascending ; pods globular (seldom formed) ; style very short. (Boripa Hitchc.) 

 — Escaped from cultivation into moist ground. (Introd. from Eu.) — Roots 

 large and long ; a well-known condiment. 



T66. E. palustrls, 



var. hispida, 



PartofiVuitlng 



raceme x %. 



765. E. palnstris. 



Part of fruiting 



raceme x %. 



24. BARBARfeA 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 aocumbent. 

 — Mostly biennials, resembling Badicula ; flowers yellow. (Anciently called 

 the Herb of St. Barbara.) 

 V 1. B. vulgaris R. Br. (Common W., Yellow Rocket.) Smooth perennial ; 

 lower leaves lyrate, the terminal division round and usually large, the lateral 

 1-4 pairs or rarely wanting ; upper leaves obovate, cut-toothei) or piimatifld %*■ 



