False Neststraw

Ancistrocarphus filagineus occurs nearly throughout the Californian Floristic Province inland from the immediate coast; in the south, it stops at the western fringes of the Mojave and Sonoran deserts; farther north, it continues into the northern Great Basin and Columbia Plateau of Oregon, northern Nevada, and southwestern Idaho. The rigid whorl of inwardly-hooked staminate paleae holds tenaciously to clothing, skin, animal coats, even vehicle tires, providing an effective dispersal mechanism. It is surprising that it has not spread farther.

Plants of populations farther inland, on drier sites and/or in deeper sandy soils, tend to be more compact with leaves shorter, more rounded, and indument denser and whitish. Stylocline filaginea var. depressa has sometimes been misapplied to these unnamed forms. The two forms intermingle enough so as not to warrant formal taxonomic status.

Plants 2–10(–14) cm. Stems usually 2–10, ascending to prostrate, sometimes 1, ± erect; branches mostly distal (sometimes absent). Leaves basal and cauline, sessile or obscurely petiolate, largest 8–16(–28) × 2–3(–4) mm, very unlike pistillate paleae; bases (of leaves or petioles) ± attenuate, 1-nerved, greenish, herbaceous, scarcely involucral. Heads in glomerules of 2–5 in ± cymiform arrays, 3.5–5 mm (excluding staminate paleae). Phyllaries usually 3–6, minute, ± equal, hyaline, unlike pistillate paleae, sometimes vestigial or apparently 0. Receptacles fungiform, 0.9–1.5 mm. Pistillate paleae: wings prominent, erect, ovate, ± plane. Staminate paleae 5, broadly lanceolate, 2.7–4.1 mm, surpassing pistillate; apices uncinate, terete, acuminate, cartilaginous, spinose. Staminate corollas actinomorphic, 1–1.5 mm, lobes (4–)5(–6), ± equal. Cypselae 1.4–2 × 0.6–0.9 mm, transverse bands 1, proximal, black.

Stylocline filaginea (A. Gray) A. Gray

Ancistrocarphus filagineus is a North American species of flowering plants in the family Asteraceae, known by the common names woolly fishhooks and hooked groundstar. It is native to western North America, including Idaho, Oregon, Nevada, California, and Baja California.

Ancistrocarphus filagineus grows in many types of habitat, including bare, rocky habitat with clay or serpentine soils and recently burned areas. It is a petite annual herb rarely more than 15 cm (6 inches) tall. It has gray, woolly-haired herbage. The linear, lance-shaped, or oval leaves are up to 3 centimeters long and are alternately arranged on the short stems. The inflorescence is a cluster of a few small star-shaped flower heads a few millimeters wide.