CRUCIFER.E. 25 



(about half an incli in length), some of them more or less confluent : racemes erect 

 densely many-flowered, 3 to 5 inches long : corolla white or cream-color wSTbl S 

 tips; the straight spur half an inch long, horizontal or ascending, very obtuse 

 exceeding he res of the flower: capsule oval or oblong, turgid; ipped witha 

 slender style : seeds shining, crestless. — Proc. Am. Acad. x. 69. 



Moist and shady ravines in the Sierra Nevada, near Truckee '{Bolander) : thence to Plumas 

 Co., E. L. Case (for whom it is named), Lcmmon, &c. Also in S. Colorado, ^Braw^ce 



Order VII. CRUCIFER^. 



Herbs, with a pungent watery juice, cruciform corolla, tetradynamous stamens, a 

 2-celled pod (silicle) with 2 parietal placenta?, and an embryo hUing the seed, with 

 cotyledons (accuiiibently or incumbeutly) applied against the radicle. — Flowers per- 

 fect, hypogynous. Calyx of 4 sepals, deciduous. Petals 4, usually with narrowed 

 base or claw, and the lamina spreading, so forming a cross, rarely wanting. Stamens 

 6, two of them inserted lower down on the receptacle and shorter than the other 

 four. Ovary 2-celled by a partition whicli stretches across from the placenta;, rarely 

 1-celled by its abortion. Style undivided or none : stigma entire or 2-lobcd. 

 Fruit the peculiar capsule or pod named a s^■%Me, or when short Si dlicle ; the 2 

 valves falling away from the placenta3 and partition, which persist, forming 'what is 

 called a repliim, in a few genera indehiscent. Ovules few or numerous, sometimes 

 solitary, campylotropous. Seeds with a smooth coat ; albumen none. Cotyledons 

 either accumbent (i. e. applied edgewise to the radicle) or incumbent (i. e. with the 

 radicle against the back of one of them), usually plane, sometimes (as in Mustard) 

 folded or wrapped around the radicle. Flowers generally in racemes and the pedicels 

 without any bract. Leaves alternate, without stipules : no glandular pubescence 



distS/rteS^S-^^^^^ 



aie staple articles of food. The order is so strictly natural that generic dlstinctbns are difficult!' 



I. Pod regularly dehiscent, 2-valved. 



* Pod strongly compressed parallel with the broad partition: cotvledons aconnihent. 



+- Pod short ; valves nerveless or faintly 1-nerved : flowers white or vellow. 



winSf'T^V ^°? ^"°'' '''^T^^^ 8 - 12-seeded; valves flat, nerveless. Seeds broa.lly 

 2 Alvs^ni vf glabrous annual, with 1-flowered scapes: flowers small, white. ^ 



'■ ^'^^^^^^t^r^^^:;,^'^^ -^- — ' ^^- Seeds wingless. 

 '• ''''^J:'{T:t^ri.Z:r'^ few-many-seeded; valves flat or convex. Seeds 



■i — H Pod elongated. 



^* ^""^"^l^rrT^"'"'' replum thickened: seeds wingless: flowers white or rose-color, mostly 



large : leaves all petroled : stems usually from running rootstocks or small tubers. 



,"*^?i^" ^°'^ ^^*^' elongated beak and very stout replum. Seed turgid. Stem few-leaved 

 neai the summit : raceme short : glabrous. 



5. Cardamine. Pod moderately beaked or pointed, less stout. Seed more flattened. Stems 



leaty, with elongated racemes. 



++ ++ Valves 1-nerved ; replum thin : seeds flat, often winged or margined : flowci-s white to 

 purple (yellow m one species of CheirantJms) : leaves entire or toothed, tlie cauline 

 sessile : root perpendicular. 



6. Arabis. Anthers short, scarcely emargiuate at base. Petnls with a flat blade and claw. 



Calyx short or narrow, rarely colored. Seetls in 1 or 2 rows. 



