102 
are ef a light violet, and form beautiful long? 
large, and thick bunches, the vexillum is white 
in the middle, the seeds are oval* It blossoms 
at the end of April. 
337. Lupinus perennis L. Rob. p. 500. 
338. Psoralea melilotoides Michx.—Psoralea Rob. p. 
500. Rising 15 to 18 inches, stem striated, 
leaves rather rough, flowers purplish, spikes an 
inch long, on very long and stiff peduncles ; calyx 
turbinated, with five acuminated and ciliated 
teeth, vexillum reflexed, keel divided into two 
petals, pod compressed, round, wrinkled, one 
seeded. It blossoms in March and April. 
339. Trifolium ludovicianum Raf. Caulibus ramosis 
prostratis striatis pubescentibus, foliolis obcorda- 
tis denticulatis, capitulis globosis longe peduncu- 
latis, leguminibus pedunculatis ovatis inflatis te» 
traspermis. Raf.—Trefle 1. Rob. p. 501. A 
small species, very common in meadows, flower® 
of a dirty white. 
340. Trifolium repens L. Rob. p. 501. Very use* 
ful ; introduced from the northern states ; it in¬ 
creases with rapidity, and destroys the weeds ; it 
keeps green in the greatest heats, and even in 
winter. 
341. Trifolium pensylvanicum Wild.—’Trefle 3. Rob. 
p. 501. Rare, in the meadows. 
342. Me Hiatus robini Raf. Caule tereti levi, foliolis 
oblongis emarginatis denticulatis, spicis axillari- 
bus, vexillum erectum, leguminibus inflatis levis 
2-3 sperars. Raf.—Melilot des Indes Rob. p. 
