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Oxytheca emarginata Rail, sp. nov. Plate XIV. Slender annual, 2-6
in. high, more or less glandular-pubescent up to the involucres,
the leaves and bracts sparsely strigose- pubescent, the whole
herbage and especially the involucres early turning red: leaves
clustered near base of stem, narrow, oblan- ceolate, ernargiuate,
4-8 lines long: bracts ternate, or the lower rarely 4 or 5 in a
whorl, ovate, awned, united at base except on one side of the stem:
peduncles 1-4 lines long; involucres obpyra- midal, 3 lines high,
shallowly 5-lobed, each lobe with a narrow white membranous margin
and tipped with an awn a line or less in length: flowers usually 4,
on short pedicels, slightly exserted, externally pubescent on the
lower half: segments 6, distinct to the base, oblanceolute,
fimbriate above into slender divisions, If lines long: stamens 9:
akene triangular, enclosed by the withering-persistent perianth.
Collected on a gravelly ridge near Tahquitz Peak, San Jacinto Mts.,
California, at about 7200 ft. alt., July 2, 1901 (H. M. Hall, no.
2331.) The type is in the Herbarium of the University of
California. The organ which immediately engages our attention on
exam- ing this species is the conspicuous red involucre, which is
formed by the coalescence of the five bracts into a concave disk,
thus simulating the disk produced by the union of the bracts around
the stem in 0. pvrfoliuta. That the disk in the proposed species
does not correspond to that in 0. perfoliafa is made clear,
however, when we consider that in the latter it encloses an inner
involucre, which itself surrounds a number of flowers, while within
the disk of 0. emarginata we find nothing but flowers, each borne
on a short pedicel. Moreover, the disk of 0. perfoliata is made up
of but 3 united bracts, as against 5 in 0...
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