Flora of North America species comparison

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Triniteurybia
Habit 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.
Involucres

cylindro-campanulate, 9–14 mm wide.
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.
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.
Heads

discoid, borne singly or 2–4 in dense, ± corymbiform arrays.
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.

Triniteurybia
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 382. Author: Luc Brouillet.
Parent taxa Asteraceae > tribe Astereae
Subordinate taxa
T. aberrans
Name authority Brouillet: Sida 21: 898. (2004)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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