340 



OHIO EXPERIMENT STATION: BULLETIN 175. 



199 High Mallow (B) *Malvasylvestris L. It is a tall plant, two or three 

 feet high, resembling- the hollyhock. The leaves are sharply five to seven lobed 

 and the petals large, purple or rose color. Occasionally found by roadsides. 

 Destroy by digging or cutting. 



200 Sida (A) *Sida spinosa L. The spiny sida, which is becoming very fre- 

 quent in the southern half of the state, especially on dry land, is a native of India. 

 It is soft-downy, 10 to 20 inches high and much branched. The leaves are long, 

 egg-shaped, tapering and sharply saw-toothed. The flowers are small, green- 

 ish yellow, shaped like those of the hollyhock. There is a little tubercle at the 

 base of the leaf on some of the plants, which gives it its name. For the soils 

 indicated the sida is very frequent about gardens and potato fields. 



Seeds dark brown, the shape of a quarter sphere, 1-12 inch long, smooth and 

 dull. Like other annuals, this weed must be prevented from seeding in order to 

 destroy it. 



201 Glade Hallow (P) *Nap<zadioicaIj. This is a tall, roughish, perennial 

 weed with very large, 9 to 11 parted lower leaves and small white flowers. It 

 is becoming introduced especially about cities. To be destroyed like low mallow. 



202 Velvet=leaf, Indian Mallow (A) *Abutilon Abutilon (L.) Rusby. Velvet- 

 leaf is a tall annual, 4 to 5 feet high, with large, velvety, heart-shaped, pointed 

 leaves; conspicuous in corn and potato fields, and especially in bottom lands. 

 The flowers are yellow, the seed capsules are urn-shaped and many pointed or 

 beaked. 



Seeds very numerous, dark gray, kidney-shaped or pipe-shaped, by reason 

 of the long nose, 1-8 inch across, slightly roughened. Found in hay, etc. This 

 weed is easily exterminated by pulling or cutting before the blossoms open. Its 

 presence does not indicate care. 



203 Bladder=ketmia, Flower=of=an=hour (A) * Hibiscus Trionum L. It is 

 a rather low, hairy annual, having three parted leaves with tapering divisions. 

 It has a sulfur-yellow, showy corolla with dark center (eye), soon closing, hence 

 the name, flower-of-an-hour. Frequent in gardens and along roadsides. Capa- 

 ble of becoming a conspicuous and obnoxious pest. 



Seeds dark gray, angular, kidney-form to obscurely pipe-shaped, 1-12 inch 

 long, with slight roughening and commonly two rounded depressions in opposite 

 sides of the seed. Deserving of complete destruction before flowering. 



ST. john's-wort FAMILY, HYPERICACE^E. 



204 St. John's=wort (P) * Hypericum perfoiatum L. 



This herb is an upright, woody-stemmed plant, 1 to 2 feet 

 high. It has opposite leaves, dotted with small black spots, 

 and bright yellow flowers with numerous stamens; see Fig. 

 36. It is a troublesome weed in pastures and meadows. 

 Seeds oblong or slightly curved, 1-20 inch long, surface 

 pitted in rows, apparently often distributed in grass seeds. 

 It is best destroyed by digging it up. 



205 Dwarf St. John's=wort (A) Hypericum mutilum 

 L. Dwarf St. John's-wort is tufted in growth, usually 

 less than a foot high, often with a height of but six inches 

 or less. Like the others, the flowers are yellow, in close 

 clusters, followed by many pointed capsules. The leaves 

 of this plant turn reddish toSvard fall and mark certain 

 soil characters at Strongsville Test Farm, indicating lack 

 of lime. Should be eliminated by improved soil conditions, 

 (notably by liming) and by cultivation. Seeds cylindrical, 



smooth, about 1-48 inch long. 



Fig. 



36. St. John's-wort. 

 {After Vasey.) 



