ORDER XIII. CRUCIFER^. 223 



Order XIIL— CRUCIPER^. {Mustard Famihj) 



Sepals 4, deciduous, cruciate ; asstivation generally imbri- 

 cate. Petals 4, cruciate, alternating with the sepals. Stamens 

 6, tetradynamous ; the two shorter lateral, occasionally toothed, 

 inserted lower than the others. Disk often with small green 

 glands inserted between the petals and the stamens and ovari- 

 um. Ovary 1-celled, consii^ting of two carpels, with two pari- 

 etal placentae, which are reflected into the cavity, where they 

 unite and form a false dissepiment. Stigma opposite the dis- 

 sepiments (a remarkable variation.) Fruit a silique or silicle, 

 2-ceIled, produced by the spurious dissepiment mentioned 

 above ; one or many seeded. Seeds campylotropous, attached 

 in a single row to each side of the placentc-e. Herbaceous 

 plants, with a watery and generally with an acrid juice, form- 

 ing Class XIV. of the Linnrean system. 



ANALYSIS. 



1. Fruit linear, a silique » 2 



Fruit nearly as broad as long, a silicle 8 



2. Seeds arranged in two rows in each cell N'asturtimn, 1 



Seeds in one row in each cell 3 



3. Silique 4-cornered Enjuimvm, 7 



Sdique terete or flat 4 



4. Flowers purple or pink Warea, S 



Flowers white 5 



Flowers yellow 7 



5. Sil'que lanceolate, flowers in terminal racemes T Dentaria, 4 



Silique linear 6 



6. Silique curved, long Anibi'', 2 



Silique straight, flowers small Cardamine, 3 



7. Silique terete, tapering, appressed to the stem Sisymhrmm, 6 



Silique oblong, linear,''comi)re^sed, few-seeded Leaveincorthid, 5 



Silique ensiform, or nearly terete Sinaj^is, 10 



8. Silicle oval, oblong Draha, 12 



Silicle reniform Coro)>opu.>t, 13 



Silicle emarginate Capaella, 15 



9. Silicle cordate LepUIium, 14 



Silicle 2-jointed, somewhat 4-angled Cakile, IG 



Genus L— NASTURTIUM. R. Br. 14—2. {Cresses.) 

 (From the Latin nasiLS tortus^ convulsed nose, from its pungent qualities.) 



Silique nearly terete, sometimes resembling a silicle, usually 

 curved. Stigma 2-lobed. Sepals spreading. Seeds arranged 

 in two series, minute, destitute of margins. Foun"d in wet 

 places. 



1. K offic:na'le, (Brown.) Leaves piniiutely diviileil ; soi,'ineMl3 

 ovnt.?, sub-cordate, repand. Petals longer than the calyx. — Wliite. 

 Ill trod need. 



2. N. tanacetifo'lium, (Hook.) Stetn much branclied, diffuse. lycavcs 

 piniiately divided, lobes sinuate or toothed, obtuse, smooth. Floicera 



