390 OROBANCHACEAE (BROOM-RAPE FAMILY) 
the ground. The crop is best used by turning under for green 
manure, before the parasite matures seed, and clover should be 
left out of rotation on that ground for several years. 
LOUISIANA BROOM-RAPE 
Orobdnche ludoviciana, Nutt. 
(Myzorrhiza ludovicidna, Rydb.) 
Native. Annual. Propagates by seeds. 
Time of bloom: June to August. 
Seed-time: July to September. , 4 
Range: Illinois to the Saskatchewan, southward to California, 
Arizona, and Texas. 
ees Parasitic on several wild plants, but has also attacked 
tobacco. 
This native Broom-rape has a wider range than either 
of its immigrant relatives, but it is only in localities 
suited to the growing of tobacco that it has shown 
itself to be harmful to plants of any value. 
Stems solitary or clustered, sometimes simple but 
usually branched, three inches to a foot in height, 
rather stout, the stalk and the scales covered with 
minute, glandular hairs. Scales lance-shaped, numer- 
ous. Flowers in dense terminal spikes, each subtended 
by one or two bracts; calyx viscidly glandular, its five 
lobes acute and nearly as long as the tube of the 
corolla: the latter is purplish, slightly curved, and 
constricted above the ovary; upper lip two-parted, 
lower one with three lobes, pointed and entire. Cap- 
sule ovoid-oblong, two-valved, full of very fine seed. 
(Fig. 271.) 
Fre. 271. 
— Louisiana 
Broom-rape 
(Oro Sat is Means of control 
. ical If the ground is newly infested, the persistent hoe- 
cutting of the parasites from the roots of their hosts 
before any seed can be perfected, piling and burning them with 
oil-soaked straw or other litter, will be well invested labor. After 
the crop is harvested and cured, the stalks should be burned. 
Plant no more tobacco on the infested ground for several seasons, 
