MUSTARD FAMILY. 63 



small, white, honey-scented, in at length elongated racemes, the round 

 little pods with a single seed in each cell. A variety much used for 

 borders has paler and white-edged leaves ; flowers all summer in gardens, 

 or in the greenhouse in winter. 



A.saxdti/e, Linn. ROCK A. Low, hoary -leaved, with abundant bright yel- 

 low flowers, in spring ; a variety with white-edged leaves is also grown. 11 



9. LESQUERELLA. (For the late Leo Lesquereux.) (D @ or ^ 

 with stellate hairs or scales, and globular, inflated pods. 



L. globdsa, Wats. or @ Stems spreading ; petals bright yellow ; 

 style longer than the pod. Ky., Tenn., Mo. Two other species occur in 

 our territory W. and S. W. 



10. ATJBRIETIA. (For Aubriet, a French botanical draughtsman.) 

 y. Pods cylindric, inflated ; seeds globular. Flowers purple. 



A. deltoidea, DC. Leaves rhombic, with 1 or 2 large teeth. Racemes 

 few-flowered. A pretty plant from S. Eu. for rockeries. Several garden 

 varieties. 



11. NASTURTIUM, WATER CRESS, HORSE-RADISH, etc. (Latin : 

 nasus tortus, convulsed nose, from the pungent qualities.) Pods short- 

 ish or short (from oblong-linear to almost spherical). Here are com- 

 bined a variety of plants, widely different in appearance. The following 

 are the commonest : 



* Petals white, twice length of calyx ; leaves pinnate. 11 Nat, from Eu. 



N. officinale, R. Br. WATER CRESS. Planted or run wild in streamlets, 

 spreading and rooting, smooth ; leaflets 3-11, roundish or oblong; flowers 

 all summer ; pods broadly linear, slightly curved upwards on their spread- 

 ing pedicels. Young plants eaten. 



* * Petals yellow, little exceeding the calyx; leaves pinnatifid. @ 



N. sessilifl6rum, Nutt. Leaves obtusely incised; flowers minute, 

 nearly sessile ; pods oblong. Common from Illinois S. 



N. obtfcsum, Nutt. Leaves pinnately parted or divided; flowers 

 minute ; pods longer than the short pedicels. 111., S. and westward. 



N. paMstre, DC. MARSH CRESS. Erect, l-3 high, with pinnatifid 

 or lyrate leaves of several oblong, cut-toothed leaflets ; small yellowish 

 flowers ; and small oblong or ovoid pods, mostly shorter than the pedicels. 

 A very common homely weed in wet places. 



* * Petals white, much longer than the calyx ; leaves undivided or the 

 lower pinnatifid. 11 



N. laciiatre, Gray. LAKE CRESS. Aquatic ; immersed leaves dissected, 

 others entire, serrate, or pinnatifid. Lakes and rivers, N. Y. to Minn., 

 and S. W. Detached leaves produce new plants, like leaf-cuttings. 



N. Armoracia, Fries. HORSE-RADISH. Leaves very large, oblong, or 

 lanceolate, chiefly from the ground, crenate, rarely cut, or pinnatifid ; 

 pods globular, but seldom seen. Planted or run wild in moist soil. The 

 long deep root is a familiar condiment. 



12. CAMELINA, FALSE FLAX. (Greek: dwarf flax; the common 

 species was fancied to be a degenerate flax.) @ 



C. sativa, Crantz. COMMON F. l-2 high ; leaves lanceolate, the 

 upper ones sagittate and clasping the stem ; the small pale yellow flowers 

 followed by obovate turgid pods in a long loose raceme ; style conspicu- 

 ous. A weed in grain and flax fields. 



