Stemmy Four Nerve Daisy

The name "Hymenoxys scaposa (de Candolle) K. F. Parker var. glabra (Nuttall) K. F. Parker" appears never to have been published. Parker did make the combination Hymenoxys acaulis (Pursh) K. F. Parker var. glabra (A. Gray) K. F. Parker based on Actinella scaposa (de Candolle) Nuttall var. glabra A. Gray, which she mistakenly called Actinea scaposa Nuttall var. glabra A. Gray.

Perennials, 14–40+ cm. Caudices often highly branched, branches not notably thickened distally. Stems 1–50, erect, sometimes branched near bases, sometimes densely woolly among proximal leaves. Leaves all basal-proximal (new leaves not tightly clustered); blades spatulate to oblanceolate to linear-oblanceolate or linear, entire or with 2 teeth or lobes, sparsely to densely hairy, ± gland-dotted. Heads 1–50 per plant, borne singly or in fastigiate arrays. Peduncles 12–40 cm, ± hairy. Involucres 5–10 × 7–12 mm. Outer phyllaries 8–16, 3.8–6.6 mm, margins 0–0.2(–0.4) mm wide, sometimes to often slightly scarious, abaxial faces ± hairy. Ray florets 12–26; corollas 7.4–22 mm. Disc florets 25–180+; corollas yellow, 2.5–3.5 mm. Cypselae 2–3 mm; pappi of 5–7 obovate to oblanceolate, aristate scales 1.6–2.3 mm.

Cephalophora scaposa de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 663. 1836; Hymenoxys scaposa (de Candolle) K. F. Parker

Tetraneuris linearis (Nutt.) Greene, Pittonia 3: 267. 1898
Aclinella scaposa linearis Nutt. Trans. Am. Phil. Soc. II. 7: 379. 1841. Ptilepida linearis Britton, Mem. Torrev Club 5: 340. 1894. Aclinella linearis A. Nelson; Coult. & Nels. Man. 560. 1909.
A scapose cespitose perennial, with a woody branching caudex, almost suffruticose ; branches elongate, 5-15 cm. long, ascending or decumbent; leaves crowded; blades narrowly linear, sparingly long-hairy and conspicuously punctate; scape 10-15 cm. long, strigose; involucre 5-6 mm. high, 8-10 mm. broad, villous; bracts elliptic, acute; ligules 8-10 mm. long, 4-6 mm. wide, strongly veined; disk-corollas 3 mm. long, puberulent; tube very short; achenes densely hirsute, 3 mm. long; squamellae lanceolate, acuminate, 2 mm. long.
Type locality: Texas.
Distribution: Texas, New Mexico, Chihuahua, and Coahuila.

Tetraneuris fastigiata Greene, Pittonia 3 : 268. 1898
Tetraneuris slenophylla Rydb.; Britton, Man. 1009. 1901. Aclinella fastigiata A. Nelson; Coult. & Nels. Man. 560. 1909.
An acaulescent perennial, branching underground; leaves crowded; blades narrowly linear, 2-4 cm. long and about 2 mm. wide, sparingly long-hairy, glabrate, conspicuously punctate, the bases broadened and 3-ribbed; scape 5-10 cm. high, strigose; involucre 6 mm. high, 10-12 mm. broad; bracts oval, obtuse or acutish, more or less villous; ligules about 10 mm. long and 4 mm. wide; disk-corollas 3 mm. long; tube very short; achenes 3 mm. long, densely hirsute; squamellae 2 mm. long, ovate-lanceolate, acuminate.
Type locality: Coolidge County, Kansas. Distribution: Plains of Kansas and Colorado.

Tetraneuris angustifolia Rvdb. Bull. Torrey Club 32 ; 128
1905.
An acaulescent cespitose perennial, but the branches of the caudex rather slender, short; leaves clustered, linear-oblanceolate to linear, 4-10 cm. long, 3-5 mm. wide, loosely and sparingly long-villous, or glabrate in age, not densely villous at the base; scape 2-3 dm. long, strigose; involucre hemispheric, 6 mm. high, about 10 mm. broad, densely villous; bracts oblong, obtuse, densely villous; ligules about 1 cm. long and 4 mm. wide, conspicuously 4nerved; disk-corollas 3.5 mm. long; tube 1 mm. long; achenes 3 mm. long, densely hirsute; squamellae 2 mm. long, lanceolate, acuminate.
Type locality: White Mountains, New Mexico. Distribution: New Mexico, Colorado, and Texas.

Tetraneuris angustata Greene, Pittonia 3 : 267. 1898
A perennial, with a rather slender cespitose rootstock; leaves narrowly linear, 5-10 cm. long, about 1 mm. wide, sparingly hairy and punctate; scape about 2 dm. long, slender; involucre 5-6 mm. high, about 10 mm. broafd, densely silkyvillous; bracts elliptic, obtuse; ligules 10-12 mm. long, 5-6 mm. wide; disk-corollas 3 mm. long, glandular-puberulent; tube less than 1 mm. long; achenes 3 mm. long, hirsute; squamellae ovate, 1.5 mm. long, the midrib produced into a short awn..
Type locality: State of Chihiiahua. Distribution: Chihuahua.

Tetraneuris scaposa (DC.) Greene, Pittonia 3: 266. 1898
Cephalophora scaposa DC. Prodr. 5: 633. 1836. Actinella scaposa Nutt. Trans. Am. Phil. Soc. II. 7: 379. 1841. Gaillardia Roemeriana Scheele, Linnaea 22: 161. 1849. Actinella lanuginosa Buckl. Proc. Acad. Phila. 1861: 459. 1862. Ptilepida scaposa Britton, Mem. Torrey Club 5: 340. 1894. Picradenia scaposa Britton; Britt. & Brown, 111. Fl. 3: 449. 1898.
An acaulescent perennial, with a short and somewhat branched but not thick caudex; leaves densely crowded at the base, oblanceolate, entire or some of them 3-5-lobed, 3-5 cm. long, covered with long loose white, or in age, ferruginous hairs; scape 5-15 cm. long, longvillous with ascending hairs; involucre 6-7 mm. high, 10-12 mm. broad, densely villous; ligules 10-15 mm. long, 5 mm. wide, conspicuously nerved; disk-corollas 4 mm. long, puberulent; tube 0.5 mm. long; achenes densely hirsute, 3 mm. long; squamellae ovate, 2 mm. long, the midrib excurrent into a short awn.
Type locality: Eastern Texas. Distribution: Texas and New Mexico.

Tetraneuris scaposa (common names stemmy four-nerve daisy and stemmy hymenoxys) is a North American species of flowering plant in the sunflower family. It is native to the southwestern and south-central United States (Nebraska, Kansas, Oklahoma, Texas, New Mexico, Arizona, Utah, and Colorado) and northern Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas, San Luis Potosí, and Zacatecas).

Tetraneuris scaposa is a perennial herb up to 40 cm (16 inches) tall. It forms a branching underground caudex sometimes producing as many as 100 above-ground stems. Leaves are concentrated low on the stem, close to the ground. Flower heads can either be present individually one per stem, or multiply in tight clumps. Each head has 12–26 ray flowers surrounding 25–180 disc flowers.