5. Stem glabrous; terminal leaflet usually about as broad as the linear lateral 



leaflets that are cuneate or short-petiolulate at base 



6. C. parviflora var. arenicola. 



1. Cardamine bult>osa (Schreb.) B.S.P. Spring-cress. Fig. 469. 



Stems erect from a short tuber, 2-6 dm. tall, simple or branched above, with 

 fine pubescence on the lower part; leaves simple; basal leaves long-petioled and 

 obovate to cordate-ovate; lower cauline leaves petioled, the upper sessile, entire 

 to remotely dentate; petals white, 7-15 mm. long; siliques linear-lanceolate to 

 linear, divaricate, 2-3 cm. long, on slender pedicels 2-3 cm. long; styles 2-3 mm. 

 long; seeds variable, suborbicular to elongate-oval. 



Wet woods, creek bottoms and marshy meadows, n.e. Okla. {Waterfall) and 

 e. Tex., Feb.-May; Tex. to Fla., Minn, and Que. 



2. Cardamine cordifolia Gray. Fig. 470. 



Erect perennial with extensively developed slender rootstocks 2-2.5 mm. thick; 

 flowering stems simple, 2-6 dm. tall, glabrous to rather densely pubescent near 

 the base with short spreading simple hairs; leaves simple, rather fleshy, glabrous, 

 almost entirely cauline, the basal ones often with a slender petiole 2 to 5 times 

 as long as the blade; blade reniform to cordate-rotund or cordate-deltoid, usually 

 sinuately crenate, 3-10 cm. wide; upper cauline leaves often with petioles pro- 

 portionately less than half as long as those of the lower leaves, the more nearly 

 cordate-deltoid blades sinuate to lobed-mucronulate and 2-6 cm. long; racemes 

 simple, ebracteate; pedicels spreading-ascending, 1-2 cm. long; sepals 3-4 mm. 

 long, glabrous, the outer ones slightly saccate at the base; petals white, obovate- 

 spatulate, long-clawed, 7-12 mm. long; stamens slightly longer than the sepals; 

 siliques straight, ascending to nearly erect, 2-3.5 cm. long, 1.5-4 mm. wide, the 

 valves very indistinctly 1 -nerved near the base; stylar beak usually 0.5-2 mm. 

 long; seeds about 1.5 mm. broad, flattened but not winged, nearly smooth. 



Mt. streams, stream banks, marshes, seepage areas and alpine wet meadows in 

 N.M. (Rio Arriba, Santa Fe, San Miguel, Lincoln, Taos and Otero cos.) and Ariz. 

 (Apache and Coconino cos.), June-Sept.; Wyo. and Ida., s. to N.M. and Ariz. 



3. Cardamine macrocarpa Brandeg. var. texana Roll. 



Herbaceous annual; stems several from base, 2-4 dm. long, glabrous, semierect 

 to decumbent, highly branched, slightly angled with a narrow wing; leaves 

 pihnatifid to simply pinnate, nonauriculate, the rachis minutely puberulent; leaflets 

 usually petiolulate, dentate to shallowly lobed, infructescences with a gyrate rachis; 

 petals greenish, strap-shaped, less than 1 mm. wide; pedicels straight, divaricate, 

 minutely puberulent to glabrous, 5-8 mm. long; siliques straight, 2.5-4 cm. long, 

 1.5-2 mm. wide; styles 1-2 mm. long. 



Damp or wet shady places in the mts. of the Tex. Big Bend region, Apr.-July; 

 Tex. to Coah. 



4. Cardamine hirsuta L. Hairy bitter-cress. Fig. 470. 



Annual; stems erect to slightly decumbent, several to numerous from the base, 

 simple or sparsely branched above, 1-2.5 (-3) dm. tall; leaves pinnately lobed, 

 basal and lower cauline with entire to shallowly dentate suborbicular lobes and 

 simple spreading trichomes on the petioles and leaf bases, upper cauline reduced 

 and usually glabrous with oblong lobes; flowers small; petals white, spatulate, to 

 3 mm. long; siliques erect, straight, 15-25 mm. long, about 1 mm. wide, the 

 valves elastic; styles 0.5 mm. long or less; seeds broadly oblong; cotyledons 

 accumbent. 



968 



