182 CRUCIFERAE (MUSTARD FAMILY) 



shaped, the base narrowing to a petiole, entire or very slightly toothed, 

 somewhat hairy, especially those that form the rosettes of autumn 

 plants ; upper leaves smooth, arrow-shaped, clasping the stem by an 

 auricled base. Flowers yellow, very small, in racemose clusters, the 

 pedicels at first fine and threadlike but lengthening and becoming 

 wiry as the pods mature. The latter are pear-shaped, two-celled 

 silicles and resemble a flax boll, though they are not quite so large ; 

 slightly flattened, with a marginal ridge, and tipped with the per- 

 sistent style which splits with the pod. Seeds brownish yellow, 

 about ten to each pod. In the company of this plant is often 

 found the Small-Fruited False Flax (Camelina 

 microcdrpa, Andrz.), smaller and more slender, 

 with pods not much more than half as large but 

 the plant is said to be even more prolific than 

 the commoner weed. 



Means of control similar to those given for 

 Hare's-ear and Indian Mustard, the smooth foli- 

 age not being susceptible to injury from spray. 



BALL MUSTARD 

 Neslia paniculata, Desv. 

 Introduced. Annual or biennial. Propagates by 



Time of bloom : June to September. 

 Seed-time: July to October. 

 Range: Ontario, Manitoba, and British Colum- 

 bia, Minnesota and the Dakotas. 

 Habitat: Grain fields and waste places. 



Stem one to two feet tall, slender, usually sim- 

 ple to the flowering stalk, finely roughened with 

 forking hairs. Basal leaves oblong to lance- 

 shaped, tapering to a slim petiole ; those on the 

 stem arrow-shaped, long-pointed, clasping the 

 stem with auricled base; all clothed with fine, 

 branching hairs. Flowers in a terminal panicle, 



_ . containing several slender racemes tipped with 



Mustard (Neslia small clusters of orange-colored blossoms, not 

 paniculate), x ?. more than an eighth of an inch across ; maturing, 



