PLOKA OF THE DISTRICT OF COLUMBIA. 163 



65. FUMARIACEAE. Fumitory Family. 



Plants perennial, with tuberous or bulblike roots; leaves all basal; flowers with 

 2 spurs at the base 1. BIEUZULLA. 



Plants annual or perennial, with fibrous roots;lleaves mostly scattered along the 

 branched stems; flowers with only one spur at the base. 

 Flowers yellow; fruit several times as long as broad, several-seeded. 



2. CAPNOIDES. 

 Flowers purplish; fruit globose, 1-seeded 3. FUMARIA. 



- 1. BIKTJKULLA Adans. 



Roots with tubers; spurs much shorter than the upper part of the flower. 



1. B. canadensis. 

 Roots bulblike; spurs almost or quite as long as the upper part of the flower. 



2. B. cucullaria. 



1. BikukuUa canadensis (Goldie) Millsp. Squirrel corn. 

 Rich woods on the islands and banks of the upper Potomac; rare. Apr. Eastern 



N. Amer. (Dicentra canadensis Walp.) 

 Flowers white tinged with pink. The flowers'are shown in plate 29B. 



2. Bikukuha cucullaria (L.) Millsp. Dutchman's breeches. 

 Rich woods along the upper Potomac; occasional. Apr. Eastern N. Amer. 



{Dicentra cucullaria Bemh.) 

 Flowers white tinged with pale yellow. The flowers are shown in plate 29A. 



2. CAPNOIDES Adans. 



1. Capnoides flavuluni (Raf.) Kuntze. Corydaus. 



Woods; common along the Potomac, occasional elsewhere. March-May. Northern 

 states, south to Va. (Corydalis fla.vula DC.) 



3. FUMABIA L. 

 1. Fumaria oflB^ciualis L. Fumitory. 



Occasional in waste ground about Washington. May-June. Native of Eur.; 

 adventive in eastern N. Amer. 



66. BRASSICACEAE. Mustard Family. 



Leaves palmately divided, the root leaves with 3 leaflets; plants with fleshy tuber- 

 like rootstocks. Flowers white or purple; pods long and narrow. .20. DENTARIA. 

 Leaves simple or pinnately divided, when pinnate the leaflets usually more than 3; 

 plants never with fleshy rootstocks. 

 Upper stem leaves sessile and clasping at the base, with conspicuous auricles, 

 entire or toothed, the lower leaves various. 

 Petals yellow. Pods long and slender; lower leaves toothed or lobed. 



22. BRASSICA. 

 Petals white. 



Lower leaves pinnately lobed; pods triangular ' 4. BURSA. 



Lower leaves merely toothed; pods not triangular. 



Pods several times longer than broad, flat 18. ARABIS. 



Pods less than twice as long as broad, often as broad as long. 

 Upper leaves entire; stems long-hairy below; podsobovoid, turgid, rounded 



at the apex 3. CAMELINA. 



Upper leaves finely or coarsely toothed; stems glabrous below or with 



very short minute hairs; pods flattened, notched or pointed at the apex. 



Pods winged, deeply notched at the apex, with 2 or more seeds in each 



cell; stems glabrous 10. THLASPI. 



Pods not winged, pointed or shallowly notched, with one seed in each 

 cell; stems finely hairy, at least below 9. LEPIDIUM, 



