Cardamine 



Cruciferae 



497 



Cardamine Douglass 



L 



o 53 



Map 1024 

 Carcfamine pratensis 

 var. palustris Wimm. & Grab. 



2966. CARDAMINE [Tourn.] L. Bittercress 



Plants perennial, base tuberous; leaves not divided, sometimes those of the stem 

 deeply toothed. 

 Flowers white; stems generally 15-45 cm high, simple or much branched, pubescent 

 at the base only, sometimes glabrous throughout or rarely more or less 



pubescent throughout 1. C. bulbosa. 



Flowers purplish (see note in text on white-flowered forms) ; stems generally 12-35 

 cm high, never branched, generally more or less pubescent all over or the upper 



part glabrous 2. C. Douglassii. 



Plants without a tuberous base; leaves pinnate. 



Petals white or tinged with purple, mostly 8-13 mm long; perennials of springy places 



and bogs 3. C. pratensis var. palustris. 



Petals white, mostly 2-3 mm long; annuals or biennials. 



Lateral leaflets of cauline leaves oblong to oval, often toothed, and usually more 

 or less decurrent on the rachis; terminal leaflet larger, obovate, usually 3- 

 lobed, sometimes entire or 5-7-lobed; plants always found in wet or moist 



so il 4. C. pennsylvanica. 



Lateral leaflets of cauline leaves generally linear, or linear-oblong, entire, not 

 decurrent on the rachis; terminal leaflet usually not larger, of the same 

 shape as the lateral leaflets or obovate and 3-lobed; plants of dry soil or 

 rarely in moist soil 5. C. parvifiora var. arenicola. 



1. Cardamine bulbosa (Schreb.) BSP. Bulb BITTERCRESS. Map 1022. 

 Frequent to common throughout the state in low places in woodland, 

 marshes, ditches, and springy places along streams and in wet places about 

 ponds, sloughs, and lakes. This species seems to find its optimum in the 

 inundated woods of the southwestern part of the state where branched 

 specimens are more frequently found. This species, as well as the next, 

 varies in the amount of pubescence. It is generally slightly pubescent near 

 the base only but specimens are found which vary from entirely glabrous 

 (with the exception of a straggling hair here and there) to pubescent up 

 to the middle. Extremely pubescent plants, however, may be albino forms 

 of the next species if we accept this form. Rarely a plant is found that is 

 glabrous except for a pubescent calyx. 



Eastern Mass. to Minn., southw. to Fla. and Tex. 



