CRUCIFEK2E. 31 



I. HESPERIDOIDES, T. & Gr. 



Leaves orate oblong, toothed, pointed ; the lower sometimes lyrate-pinnatifid. 



Banks of rivers. Western Pa. May, June. Stem 1 to 3 feet high. Petals }£ 

 tnch long, spatulate. Pods 1 to 2 inches long, slightly curved upwards, longer 

 than the" spreading pedicels, knotty, rather fleshy. 



16. CARDAMINE. Linn. 



Kardamon, an ancient Greek name of Cress. 



Calyx a little spreading. Pod linear, flattened usually 

 opening elastic-ally; valves nerveless. Seeds in single rows 

 in each cell, ovate, not margined. — Mostly perennial plards 

 with white or purple flowers. 



1. G. hirsuta, L. Hairy Cardamine. 



Mostly smooth. Leaves pinnate, with 5 to 13 leaflets, or lyrately pinnatifid; 

 leaflets of the radical ones petiolcd, mostly rounded ; those of the stem ovate or 

 linear, toothed or entire ; petals twice as long as the calyx, oblong-cuneate ; stigma 

 minute, erubsessile. 



A variable biennial, common in wet places. May — July. Stem 6 to 16 incbeg 

 high. Leaves hairy or smooth, % to 1 inch long. Flowers small, white. Fed 

 about 1 inch long, 12 to 18-seeded. 



2. C. RHOMBOIDEA, DC Spring Cress. 



Root tuberous; stem-leaves ovate-rhomboid, somewbat petioled ; roct-lcares round 

 or coidate, all somewbat angled or sparingly toothed ; pods linear-lanceolate, 

 pointed with a slender style, tipped with a conspicuous stigma; seeds round- 

 oval. 



Wet moadows and springs. Per. April — June. Stem 9 to 12 inches high, cre^ 

 smootb, simple. Flowers in terminal racemes, large, white or reddish. Fods % to 

 1 inch long. 



3. C. ROTUNDIFOLIA, Mich. Round -leaved Spring Cres&. 



Root fibrous; stem weak, procumbent: leaves sub-orbicular. sub-dentate, smooth, 

 petioled: pod spreading, slender, with a long style. 



Wet grounds near springs. Per. July. Stem C to 15 inches high, decumbent. 

 Floxvers in terminal racemes, white or yellowish, half the size of the preceding. 

 J^od % to % mcn l° n o- 



17. SISYMBRIUM. Linn. Hedge Mustard. 



An ancient Greek name of some plant of this family. 



Calyx mostly spreading, equal at the base. Petals un- 

 guiculate, entire. Pod terrete, or rather 4 to 6 sided, ses- 

 sile upon the disk, the valves 1 to 3 nerved. Seeds in a 

 single row in each cell, oblong, marginless. — Annual herbs 

 with small white or yellow flowers. 



1. S. officinale, Scop. Hedge Mustard. 



Leaves runcinate and with the stem hairy. Flowers in a long raceme ; pod «tbo- 

 late, closely pressed to the stem. 

 Waste places. Introduced. May— Sept. An unsightly branched weed, 1 to 3 



