432 



CRUCIFEBAB (MUSTARD FAMILY) 



764. R. sinuata. 

 Leaves and part of 

 fruiting raceme x %. 



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

 the short lobes nearly entise, linear-oblong ; pods linear-oblong ((5-10 mini 

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

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

 June. FIG. 764. 



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

 fibrous roots; flowers small or minute, greenish or 

 yellowish; leaves somewhat lyrate. 



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

 simple ; leaves obtusely incised or toothed, obovate or 

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

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

 Nutt.; Horipa Hitchc.) Richmond, Va. (Churchill) to 

 Neb., e. Kan. and south w. 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. ; Eoripa Britton.) Low ground, n. Mich. 

 (FarwelV) to Tex. and westw. 



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

 pedicels. (Nasturtium Gray; Eoripa Britton.) 111., and south westw. 



6. R. paliistris (L.) Moench. (MARSH 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.; Horipa Bess.) Wet places or in 

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

 FIG. 765. 



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

 so. (Horipa hispida Britton; Nasturtium 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, \-celled, 

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

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

 Aug. 



8. R. ARMORA.CIA (L.) Robinson. (HORSERADISH.) Root-leaves very large, 

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

 ascending; pods globular (seldom formed) ; style very short. (Horipa 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 Hadicula; 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 



766. E. palustris, 



var. hispida. 



Part of fruiting 



raceme x %. 



765. E. palustris. 



Part of fruiting 



raceme x 2 / 3 . 



