432 



CRrCIFERAE (MUSTARD FAMILY^) 



764. R. sinuata. 



Leaves and part of 



fruiting raceme x %. 



3. R. sinuata (Niitf.) Greene. Stems low. «liffuse; Teavea pinna tehj rlpft^ 

 the short lobes nearly entire, linear-oblong ; pods linear-oblong ((J-IO mm. 



long), on slender pedicels ; style slender. (Xostnrtium 

 Nutt. ; Hoj'ipa Ilitchc.) — Banks of the Miss, and westw. 

 June. Fig. 764. 



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

 fihrons roots; floioers small or minute^ greenish or 

 yellowish ; leaves somewhat lyrate. 



4. R. sessilifl5ra (Xutt.) Greene. Stems erect, rather 

 simple ; leaves obtusely incised or toothed, obovate or 

 oblong ] flowers minnte., nearly sessile ; pods elongate-oblong 

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

 Nutt.; Boripa Hitclic.) — Richmond, Va. (Churchill) to 

 Neb., e. Kan. and south w. Apr.-.Tune. 



5. R. obtusa (Xutt.) 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- 

 turtiinn ^nlX,. \ Boripa Britton.) — Low ground, n. Mich. 

 (Farwell) to Tex. and westw. 



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

 pedicels. (Xa.^turtium Gr?ij; Boripa Britton.) — 111,, and southwestw. 



6. R. paliistris (L.) Moencft. (^rAHsn Cress.) 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-cylindric 

 ellipsoid or ovoid pods; style short. (Nastur- 

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

 shallow water ; common. June-Sept. (Eurasia.) 

 Fig. 765. 



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

 so. (Boripa hispida Britton; Nastmrtitim palustre, var. Gray.) 

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



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

 undivided^ or the lower ones pinnatifid ; root perennial. 



7. R. aquatica (Eat.) Robinson. (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. (Boripa americana Britton ; Nasturtium lacustre 

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

 Aug. 



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

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

 a.scending ; 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. 



766 



E. palustris, 

 var. hispida. 

 Part of fruiting 

 raceme x %. 



765. K. palustris. 



Part of fruiting 



raceme x %. 



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 pinnatifid at 



