i32 



CRUCIFERAE (MUSTARD FAMILY*) 



764. E. sinuata. 

 Leaves and part of 

 fruiting raceme X %. 



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



the Ohort lobes nearly entire, linear-oblonc; ; pods linear-oblong ((5-10 nun. 



long), on slender pedicels ; style slender. {Nasturtium 



Nutt.; Eoripa Hitchc.) — Banks of the Miss, and westw. 



June. Fig. 764. 



** Ayinual or biennial., rarely perennial (?), with simple 

 fibrous roots; flowers small or minute., greenish or 

 yellowish; leaves somewhat lyrate. 



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

 simple ; leaves obtusely incised or toothed, obovate or 

 oblong ;^otoe9-s minute, nearly sessile ; pods elongate-oblong 

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

 Nutt.; Boripa Hitchc.) — 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. (iVas- 

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

 (Fanoell) to Tex. and westw. 



Var. sphaerocarpa (Gray) Kobinson. I'ods globular, about equaling the 

 pedicels. (Nasturtium Gr^j ; Boripa Biitton.) — 111., and southwestw. 



6. R. palustris (L.) Moench. (Marsh Cricss.) Stem erect, 

 S-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 

 Uowers and mostly longer than the short-cylindric 

 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, var. Gray.) 

 — With the type; the commonerformeastw. (Eurasia.) Fig. 766. 



§3. Petals white, much longer than the calyx; pods ovoid or globular; leaves 

 undivided, or the lower ones pinnatifld ; root perennial. 



1. R. aqudtica (Eat.) Robinson. (Lake Cress.) Aquatic ; immersed leaves 

 1-8-pinnately dissected into numerous capillary divisions ; emersed leaves oblong, 

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

 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. ArmorAcia (L.) Robinson. (Horseradish.) Root-leaves very large, 

 oblong, crenate, rarely pinnatitid, 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. 



24. 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 accumbent. 



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

 the Herb of St. Barbara.) , . , 



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-toothed, or pinnatifld at 



766. E. palustris, 



var. hispida. 



Part of fruiting 



raceme x %. 



765. E. palustris. 



Part of fruiting 



raceme x %. 



