Triniteurybia

Brouillet

Sida 21: 898. 2004.

Etymology: Latin trinitas, trinity, alluding to Trinity Lake, type locality of the species, and genus Eurybia, a close relative
Treatment appears in FNA Volume 20. Treatment on page 382. Mentioned on page 13, 362, 365.
 TaxonIllustrator 
FNA20 P41 Eurybia hemispherica.jpegEurybia hemispherica
Triniteurybia aberrans
Xanthisma texanum var. drummondii
Yevonn Wilson-Ramsey
Linny Heagy
Yevonn Wilson-Ramsey

Perennials, 5–25 (–30) cm (cespitose; caudices woody, ramified, from slender creeping taproots). Stems erect, simple, slender, stipitate-glandular. Leaves basal and cauline; alternate; basal (mostly persistent) petiolate to subsessile, distal sessile; blades 1-nerved, obovate or oblong to broadly oblanceolate margins sparsely spinulose-serrate, faces stipitate-glandular. Heads discoid, borne singly or 2–4 in dense, ± corymbiform arrays. Involucres cylindro-campanulate, 9–14 mm wide. Phyllaries ca. 30 in 3–4 series, 1-nerved (keeled), lance-oblong to lanceolate (outer) to linear-lanceolate (inner), unequal, bases indurate, distal green zones ± basally truncate to diamond-shaped, occupying distal 1/3, faces glandular-viscid. Receptacles slightly convex, pitted, epaleate. Ray-florets 0. Disc-florets 25–50, bisexual, fertile; corollas yellow and often reddish (particularly lobes), barely ampliate, tubes shorter than slenderly cylindric throats, lobes 5, erect, lanceolate (minutely and sparsely puberulent); style-branch appendages lanceolate. Cypselae fusiform, ± 3 mm, ± 10-nerved, faces densely white strigoso-hirsute, eglandular; pappi persistent, of 20–35, unequal, barbellulate, stramineous, some apically ± clavate bristles in (1–) 2 series. x = 9.

Distribution

nw United States

Discussion

Species 1.

Originally described as a Macronema species, Triniteurybia aberrans was treated by H. M. Hall (1928) in Haplopappus sect. Tonestus on the basis of habit and foliage, though style branches indicated affinities to sect. Macronema. After disposal of other members of Haplopappus in segregate genera, G. L. Nesom and D. R. Morgan (1990) placed the species in Tonestus on the basis of its herbaceous habit, long-stipitate glands, well-developed, coarsely dentate cauline leaves, few heads, and 1-nerved phyllaries, all characteristics also found in the eurybioid complex. Molecular phylogenetic data (L. Brouillet et al. 2004) indicate that this species belongs to the eurybioid complex (J. C. Semple et al. 2002), as sister to the Machaerantherinae. The cylindro-campanulate heads with imbricate phyllaries and a wide green area, and the coarse, dentate foliage, are similar to those of Eurybia. The lack of ray florets clearly distinguishes Triniteurybia.

Selected References

None.

... more about "Triniteurybia"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +
Brouillet +
petiolate +  and subsessile +
decurrent +
indurate +
oblong;broadly oblanceolate +
rugulose +  and muricate +
not 2-lipped +  and actinomorphic +
yellow and often reddish +
ampliate +
beaked +, 2-ribbed +  and 5-ribbed +
fertile +  and bisexual +
fertile +  and bisexual +
nw United States +
Latin trinitas, trinity, alluding to Trinity Lake, type locality of the species, and genus Eurybia, a close relative +
strigoso-hirsute +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
cylindro-campanulate +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
lanceolate +
2-carpellate +
persistent +
lance-oblong +  and lanceolate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
stipitate-glandular +
slender +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Triniteurybia +
Asteraceae tribe Astereae +
cylindric +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +
glandular-viscid +
less basally truncate +  and diamond-shaped +