eee. 
ae | 
SSN Mee 
1906] HOUSE—NEW SPECIES OF TRIFOLIUM 345 
Trifolium cognatum, sp. nov.—Fig. 12.—Related to T. longi- 
jolium. Minutely pubescent or glabrate; stems spreading or ascend- 
ing from a thickened per- b 
ennial root, 10 to 30°™ high, ; 
often somewhat tinged with 
dull purple below, striate: 
stipules ovate or the lower 
ovate-lanceolate, green, acu- 
minate, entire and scarious 
margined, 12 to 16™™ long; 
leaflets _ elliptical- oblong, 
subcuneate at base, glab- 
rous, rounded and minutely 
mucronate at apex, 8 to 
20™™ long, 4 to 10™™ wide, 
margins minutely and _ir- 
regularly denticulate; peti- 
oles 2 to 4 times as long 
as the leaflets: peduncles 
exceeding the leaves; heads 
subglobose, 15 to 40-flow- 
ered; flowers erect when Fic. 12.—Trifolium cognatum House: 4, stipule 
young, soon becoming en- and leaflets; 5, flower; ¢, calyx expanded; d, ban- 
: ner, wings, and keel. 
tirely reflexed, their pedicels 
2 to 4™™ long: calyx with a few scattered hairs, the tube 10-nerved, 
about 1™™ Jong, the subequal, subulate-acuminate teeth 3 to 3.5™™ 
long: corolla 7 to 9™™ long; banner violet-purple, ascending, retuse 
at apex, nearly s™™ broad; wings and keel shorter and yellowish: 
legume 3 or 4-seeded. 
Barren hills above Pachuca, Hidalgo, 2600-2g00™ alt., Pringle (no. 6933), 
in U. S. National Herbarium. 
Although fully matured legumes are not present on the type, the species is 
purple and yellow flowers. 
