28 CBUCiFEE^. (mustakb familt.)' 



Eocks by streams, Vermont to Wisconsin and Kentucky. April - July. — Glau- 

 cous : flowers golden-yellow and showy, or paler and less handsome. Pods 

 1' long, uneven. 



2. C. glanca, Pursh. (Pale Cokydalis.) Stem upright ; racemes 

 panicled ; spur short and rounded ; pods eract, slender, elongated ; seeds with a 

 small entire crest. — Eocky places; common. May -July, — Corolla whitish, 

 shaded with yellow and reddish. 



4. PUMARIA, L. PuMiTOET. 



Corolla l-spun-ed at the base. Style deciduous. Fruit indehiscent, small, 

 globular, 1-seeded. Seeds crestless. — Branched annuals, with finely dissected 

 compound leaves, and small flowers in dense racemes or spikes. (Name from 

 fumus, smoke.) 



1. P. oPFiciNiLis, L. (Common Pumitokt.) Sepals ovate-lanceolate, 

 acute, sharply tcothed, naiTowcr and shorter than tlio corolla (which is flesh- 

 color tipped with crimson) ; fruit slightly notched. — Waste places, about dwell- 

 ings. (Adv. from Eu.) 



Order 12. CRUcIfERjE. (Mustard Family.) 



Herbs with a pungent watery juice and cruciform tetradynamous flowers : 

 fruit a sUique or silicic. — Sepals 4, deciduous. Petals 4, hypogynous, reg- 

 ular, placed opposite each other in pairs, their spreading limbs forming a 

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

 2-celled by a thin partition stretched between the 2 marginal placentEe, 

 from which when ripe the valves separate, either much longer than broad 

 (a silique), or short (a sillele or poucJi), sometimes indehiscent and nut-like 

 (nucumentaceous), or separating across into 1-seeded joints Qoraentaceous'). 

 Seeds campylotropous, without albumen, filled by the large embryo, which 

 is curved or folded in various ways : i. e. the cotyledons accumhent, viz. 

 their margins on one side applied to the radicle, so that the cross-section of 

 the seed appears thus oQ ; or else incumbent, viz. the back of one cotyle- 

 don applied to the radicle, thus o(J). In these cases the cotyledons are 

 plane ; but they may be folded upon themselves, as in Mustard, where they 

 are conduplicate, thus i^. In Leavenworthia alone the whole embryo is 

 straight. — Leaves alternate, no stipules. Flowers in terminal racemes or 

 corymbs : pedicels not bracted. — A large and very natural family, of 

 pungent or acrid, but not poisonous plants. (Characters taken from the 

 pods and seeds j the flowers being nearly alike in all.) 



Synopsis. 



I. SILlQUOSiE. Pod long, a silique, opening by valves. 



Tbibe I. ARABIDE^. Pod elongated (except in Nasturtium). Seeds flattened. Co- 

 tyledons accumbeut, plane. 



