' oe. 
321 
Cumberland Basin, La Plata Mountains, Colorado. In flower July 23, 1890 and 
1891, and in fruit August, 1892, 
Miss Eastwood sent this plant in for several years; the last time with good fruit, 
so that its position can be satisfactorily determined. It is with much pleasure that 
we can name a new species for this diligent collector. This species and L. macounii 
are very much alike in habit and quite different from all the other North American 
species. 
EXPLANATION OF PLATE.—Fig. a, fruiting umbel, natural size; b, carpel, dorsal view, enlarged 5 
diameters; c, cross section of the same, enlarged 11 diameters. 
Velza glauca Coult. & Rose, sp. nov. PLATE XIV. 
Shortly caulescent, slender, 4.5 dm. or less high, erect or somewhat spreading, 
glabrous and somewhat glaucous; radical leaves small, bi- or tri-ternate; stem leaves 
often simply ternate; leaflets small, 12 mm. or less long, mostly cordate or truncate 
at base, often 3-lobed or 3-parted, irregularly toothed; umbel 7- to 15-rayed, with no 
involucre and involucels of small linear bracts; rays 2.5 to 5 cm. long; pedicels 
2mm. or less long; fruit orbicular, 2mm. in diameter; carpophore parted below the 
middle; flowers yellow. 
Oregon, Canyonville (Thomas J. Howell, April, 1881), Glendale (Thomas J. Howell, 
April 30, 1887), Woodville (Joseph Howell, May, 1888, and April 1, 1889). 
After a study of the so-called glabrous forms of V. kelloggit in the light of more 
material and the notes kindly furnished by Mr. Joseph Howell, we feel convinced 
that this requires separation as a distinct species. 
V. glauca differs from V. kelloggii, especially in its habit, glabrous stems and leaf- 
lets, and smaller fruit. 
EXPLANATION OF PLATE.—Fig. a, fruiting umbel; b, carpel, side view, enlarged 5 diameters. 
THUROVIA, A NEW GENUS OF COMPOSITAE. 
Thurovia Rose, gen. nov. 
Heads discoid, few-flowered, sessile in the axils of the leaves: flowers hermaphro- 
dite, fertile. Involucre small, oblong to oval; bracts in two series; the outer bracts 
about 5, linear, with conspicuous green tips; the inner bracts 3, somewhat inclos- 
ing the akenes, larger, with small green tips. Corolla regular, 5-toothed with 
broad funnel-form throat, proper tube short. Stamens entire at base: style branches 
short, comose-bearded, and with long slender appendages. Akenes small, turbinate, 
silky-pubescent, not nerved. Pappus of about 10 lanceolate, acuminate palew.—A 
low, spreading, much-branched glabrous annual, Leaves small, linear, alternate; 
involucre sessile mostly solitary iu the axils of the leaves. Flowers white. 
The relationships of this genus are obscure. In habit it most resembles the 
Asteroidew. Mr, Thurow writes me that he collected it for a small-flowered Aster, 
Its habit, however, is more that of Gutierrezia or Greenella, especially of the latter 
genus. I have submitted a specimen to the well-known authority on this family, 
Dr. O. Hoffmann, of Berlin, but he points out that it has not the form of the style 
of thistype. Itis true, however, that Lessingia has somewhat similar style branches 
with the same peculiar wreath of brush-like hairs. Dr. Hoffmann suggests that its 
relationships are with the Helianthoidee, He would place it in the neighborhood 
of Eriophyllum, but as distinct from the related genera in its few-flowered heads 
and habit. 
This genus has been named for Mr. F. W. Thurow, a local collector of Hockley, 
Texas, who has already discovered several new species in this region. 
Thurovia triflora Rose, sp. nov. PLATE XV. 
Low, 20 to 45 cm. high, either bushy or straggling; leaves 6 to 18 mm. long; 
involucre 3 mm. long, 3-flowered; akenes 1 mm. long; palew 2 mm. long. 
Common on the prairie northwest of Houston, Texas. 
Collected October 25, 1892, by F. W. Thurow. 
