62 cruciferjE. (mustard family.) 



acutelt/ margined, rugose-reticulated ; aril loose : otherwise as in the next. — 

 Pennsylvania to Wisconsin and southward. 



3. C. atirea, Willd. (Golden C.) Stems low or decumbent; racemes 

 simple; corolla golden-yellow, §' long; slightly decurved spur somewhat shorter 

 than the pedicel, not half the length of the rest of the flower; tips of outer petals 

 blunt, crestless and naked on the back, little longer than the inner ; pods usually 

 pendent ; seeds smooth and even, or sometimes very minutely reticulated, turgid, 

 marginless, partly covered by the scale-shaped aril. — Eocky places, Vermont to 

 Penn., Wisconsin, and northward. April- July. — Var. micbAntha, Engelm., 

 is a state with minute spurless flowers (probably fertilized in the bud), and 

 ascending pods, on very short pedicels. — W. Illinois and St. Louis, Eiehl. 



(C. MONTANA, Engelm., or perhaps rather C. atjkea, var. occidentalis, 

 Engelm., Missouri to Texas and westward, differs from the Eastern C. aurea in 

 the often ascending spur nearly equalling the rest of the corolla and longer than 

 the pedicel, erect or ascending pods, and seeds lenticular with acutish margin. 



— C. cuEVisfLiQUA, Engelm., of Southwest, differs from this in longer 4-an- 

 gular pods ascending on very short pedicels, the acute-margined seed muricate! 



— C. cbystAllina, Engelm., of Southwest, differs from this in the very broad 

 but short wing on tip of outer petals, short few-seeded pod covered with crys- 

 talline vesicles, and sharper- margined tubercular-reticulated seeds. ) 



4. PUMARIA, L. EuMiTORT. 



Corolla 1 -spurred at the base. Style deciduous. Eruit indehiscent, small, 

 globular, 1 -seeded. Seeds crestless. — Branched and leafy-stemmed annuals, 

 with finely dissected compound leaves, and small flowers in dense racemes or 

 spikes. (Name from /umus, smoke.) 



1. F. OFFICINALIS, L. (Common Ecmitokt.) Sepals ovate-lanceolate, 

 acute, shai'ply toothed, narrower and shorter than the corolla (which is flesh- 

 color tipped ynih crimson); fruit slightly notched. — Waste places, about 

 dwellings. (Adv. from Eu.) 



Order 10. CRUCIFERa;. (Mustard Famili.) 



Herbs, loith a pungent watery juice and cruciform tetradynamous flowers : 

 fruit a sitique or silicle. — Sepals 4, deciduous. Petals 4, bypogynous, 

 regular, placed opposite each other in paii-s, their spreading limbs form- 

 ing a cross. Stamens 6, two of them inserted lower down and shorter 

 (rarely only 4 or 2). Pod 2-celled by a thin partition stretched between 

 the two marginal placentaa, from which when ripe the valves separate, 

 either much longer than broad (a sitique'), or short (a silicle or pouch), 

 sometimes indehiscent and nut-like {nucumeniaceous), or separating across 

 into 1-seeded joints Qomentaceous). Seeds campylotropous, without albu- 

 men, filled by the large embryo, which is curved or folded in various 

 ways : i. e. the cotyledons accumhent, viz. their margins on one side ap- 

 plied to the radicle, so that the cross-section of the seed appears thus cQ] ; 



