San Felipe Dogweed

Perennials or subshrubs, 20–50+ cm. Leaves pinnately lobed, 15–40 mm, lobes 3–5, linear to cuneate or oblanceolate (oil-glands at base of each lobe and subterminal in tips). Peduncles 20–80 mm. Calyculi of 12–16 subulate bractlets 3–8 mm (bearing glands). Involucres obconic, 10–15 mm. Phyllaries 12–20, lanceolate, separating in fruit. Ray florets 10–14; corollas yellow, becoming red-orange; tubes ca. 2 mm, laminae 6 × 2 mm. Disc florets 25–40; corollas yellow-orange, 7–8 mm. Cypselae 5 mm; pappi of 8–12 scales 7–8 mm, each comprising 7–11 basally connate bristles. 2n = 26.

Dyssodia porophylloides A. Gray, Mem. Amer. Acad. Arts, n. s. 5: 322. 1854

Clomenocoma porophylloides (A. Gray) Rydberg
Dyssodia porophylloides A. Gray, Mem. Am. Acad. II. 5: 322. 1854. Lebetina porophylloides A. Nelson, Bot. Gaz. 47: 435. 1909.
A perennial, with a thick woody base; stems glabrous, several, 2-4 dm. high, with strongly ascending branches; leaves mostly alternate, 1-2 cm. long, pinnately dissected into 3-5 subulate or lanceolate, spinulose-serrate or entire divisions, glandless, thick; peduncles 3-8 cm. long; involucre turbinate, 12 mm. high and about as broad; principal bracts 14-20, linear, acute or mucronate, the glands various, 1 or 2 terminal and median, and 1-4 lateral on each side; accessory bracts subulate, about half as long, with a single gland; ligules orange, elliptic, about 5 mm. long; disk-corollas 8 mm. long; lobes lanceolate, often tinged with purple; achenes 5 mm. long, striate, hirsutulous; squamellae 10-12, 7-8 mm. long, each dissected into 7-11 bristles.
Type locality: Sandy hills near San Felipe, between .San Diego and the Colorado, California. Distribution: Arizona, southern California, and Lower California.

Adenophyllum porophylloides is a species of flowering plant in the family Asteraceae known by the common names San Felipe dogweed and San Felipe dyssodia. It is native to the Sonoran and Mojave Deserts of the southwestern United States (Arizona, California, Nevada) and northwestern Mexico (Sonora, Baja California, Baja California Sur).

Adenophyllum porophylloides is an aromatic desert subshrub with several branching stems reaching a maximum height near 60 centimeters. The sparse, clawlike leaves are divided into sharply pointed linear lobes that bear prominent resin glands. The foliage has an unpleasant scent. The inflorescence is borne on a peduncle several centimeters long. The flower head is cylindrical and lined with phyllaries with large resin glands on them. The tip of the head blooms with bright yellow to reddish orange disc florets. There are sometimes short, stubby yellow to reddish ray florets along the rim. The fruit is an achene about 5 millimeters long with a bristly, scaly pappus.

Adenophyllum porophylloides là một loài thực vật có hoa trong họ Cúc. Loài này được (A.Gray) Strother mô tả khoa học đầu tiên năm 1986.