Chrysoma

Nuttall

J. Acad. Nat. Sci. Philadelphia 7: 67. 1834

Etymology: Greek chrysos, gold, and - ome, having the condition of alluding to predominantly yellow-gold heads and corymbs
Treatment appears in FNA Volume 20. Treatment on page 105. Mentioned on page 5, 96, 108.
Shrubs, 50–100 cm (evergreen), glabrous, resinous. Stems erect, branched. Leaves cauline; alternate; sessile; blades 1-nerved, oblanceolate to narrowly elliptic (bases sometimes attenuate), margins entire, faces gland-dotted, resinous (covered by reticulum of subisodiametric areoles, each areole surrounded by sunken border). Heads usually radiate, sometimes discoid, in dense (terminal), cymiform arrays. Involucres cylindric, (5–6 ×) 2–2.5 mm. Phyllaries 8–12 in 3–4(–5) series (in vertical ranks), erect, loose, stamineous, 1-nerved (midnerves orange-resinous from bases to apices; flat), lanceolate, unequal, margins scarious. Receptacles flat, shallowly pitted, epaleate. Ray florets (0–)1–2(–3), pistillate, fertile; corollas yellow. Disc florets (2–)3–4(–5), bisexual, fertile; corollas yellow, tubular-funnelform, tubes longer than throats, lobes 5, spreading-recurving, lanceolate; style-branch appendages linear-triangular (closely papillate). Cypselae (brownish) turbinate-oblong, nearly terete, 8–10-ribbed, densely strigoso-sericeous; pappi persistent, of 40–60 tan, unequal, barbellate, apically attenuate bristles in 2–3 series. x = 9.

Distribution

se United States.

Discussion

Species 1.

Chrysoma pauciflosculosa was originally described within Solidago; it is distinct in anatomy (F. E. Lloyd 1901; K. Phillips 1963; L. C. Anderson and J. B. Creech 1975) and other features. Chrysoma is recognized by its shrubby habit, areolate-resinous leaves, corymbiform arrays of glomerate, cylindric, few-flowered heads, long disc corolla lobes, and papillate style-branch appendages.

Lower Taxa