324 



OHIO EXPERIMENT STATION: BULLETIN 175. 



Seeds black, flat, smooth, kidney-shaped with beak, 1-16 inch long, marked 

 with tubercular spots. From the situation in which this occurs, close and 

 frequent cutting - with salting would seem a good method of extermination; as 

 with other plants having rootstocks, the cutting will need to be followed for two 

 or more seasons. Where the ground can be plowed, cultivation may succeed but 

 it is more likely to spread than destroy the weed. In a few years it will be too 

 late to destroy this weed in many localities. 



114 Deptford Pink (A)* Dianthns Armeria L. This is a little pink with 

 narrow, linear, hairy leaves and small, rose-colored, white-dotted petals. It 

 is becoming scattered. Like the other annuals of this family it must be kept 

 out by scrutiny of seeds and by cultivation. 



115 Chickweed (A) *Alsine media L. This winter annual, Fig. 21, is as 

 well known to gardeners as purslane. Its small, smooth leaves and very small 

 flowers, whose white petals are shorter than the green sepals, make it easy of 

 recognition. It appears to root slightly and to spread extensively in moist, 

 enriched ground. It may be found in blossom almost the entire year, and ripens 

 seeds so early that it is difficult to clean out. This plant is likewise a host of 

 the melon louse, Aphis gossypii Glover. 



Fig. 21. Chickweed. 



Seeds brown, almost or quite circular, flattened, with notch and beak atone 

 side, about 1-32 inch across, tuberculate, much like soap wort, shown in Fig. 21; 

 a natural size; £ x 6. It seems best controlled by some winter crop, such as rye, 

 hairy vetch or crimson clover to crowd it out. 



116=1 17 Mouse=ear Chickweed (P&A) *Cerastium vulgatum L., and *Ccrasti- 

 um viscosum L. These two chickweeds, of which the former is the larger and 

 perennial, grow much like the preceding but have hairy leaves. One or the 

 other is often found with it in similar locations. To be dealt with in the 

 same way. 



118 Jagged Chickweed (A) *Holosteum umbellatum L. An additional 

 chickweed with umbelled flowers and notched petals is reported from Cincinnati 

 by W. H. Aiken. It is to be ranked with other annual chickweeds in weedy 

 characters. 



