TR AE ETT: ALR, OES A nee 
ee ae 
a eT TTT ag, 
f 
{ 
1906] HOUSE—NEW SPECIES OF TRIFOLIUM 347 
1801; not 7. involucratum Lam. 1778; T. sii ak Greene, Pittonia 
a 186. 1897. 
Both WILLDENOW and SPRENGEL seem uncertain regarding the native country 
of this species and the identification of Willdenow’s name with an American 
species is perhaps first made by . (Nov. Gen. & Sp. 6:502. 1823): 
“Crescit prope Valladolid Mexicanorum alt. 1000 hex.” 
is species, not rare throughout northern Mexico, is not at all closely related 
to the species of California which for so long has passed as T. involucratum and . 
which Professor GREENE has shown to be T°. Wormskioldii Lehm. 
The important characters of T. Willdenovii are the linear-lan- 
ceolate stipules, subulate-acuminate and _lacerate-toothed; the 
involucre divided nearly to the base into 6 to 8 nearly simple, subu- 
late-aristate segments, resembling in this respect the T. spinulosum 
of northwestern United States, but not 7. Wormskjoldii of Cali- 
fornia. The leaflets are all linear and apiculate, except those of 
the lower leaves which are relatively broader; the purple flowers 
are from 16 to 18™™ long, in large erect heads; the banner very 
narrow and retuse at apex. 
Chihuahua: Nelson (no. 6054), 1899; Townsend and Barber (no. 60), 1899, 
Goldman (no. 430), 1899; Palmer (no. 309), 1885; ee (no. 1209), 1887. 
Durango: Palmer (no. 238), 1896; Nelson (no. 4768 
San Luis Potosi: Parry and Palmer (no. 135), 1878; : ae (no. 602), 
187 
Valley of Mexico: Bourgeau (no. 79), 1865-66, Pedregal, near Tlalpam, 
Rose and Hough (no. 4518), 1899. 
CLEMSON COLLEGE, 
South Carolina. 
