Xanthocephalum gymnospermoides (A. Gray) Benth. & Hook. f.
Family: Asteraceae
San Pedro matchweed,  more...
[Grindelia gymnospermoides (A. Gray) Ruffin,  more]
Xanthocephalum gymnospermoides image
Liz Makings  
Plants 30-150 cm, herbage glabrous. Stems usually 1, erect. Leaf blades 40-100 mm, bases narrowly decurrent, margins entire to spinulose-toothed, faces resinous. Heads usually in tight to loose, corymbiform arrays, rarely borne singly. Peduncles: ultimate 1-40 mm, minutely stipitate-glandular. Phyllaries minutely stipitate-glandular. Ray corollas 4-11 mm. Pappi (ray) 0, outer disc 0 or minute crowns, inner nearly 0 or minute crowns, sometimes lacerate or with awnlike scales 0.2-0.8 mm, rarely with ring of persistent, 15-20, antrorsely ciliolate bristles ca. 1.4 mm. 2n = 12. Flowering (Jul-)Aug-Oct. Meadows, stream bottoms, ditches, grasslands, areas of oak-pine or pine woodlands, usually in habitats at least intermittently wet; 1100-2700 m; Ariz., Tex.; Mexico (Chihuahua, Durango, Jalisco, Sonora, Zacatecas).
FNA 2006, Martin and Hutchins 1980, Kearney and Peebles 1969, Wiggins 1964
Duration: Annual Nativity: Native Lifeform: Forb/Herb General: Stout herbaceous annual to 1.5 m tall, glutinous and sometimes sparingly tomentose in youth, very leafy to apex. Leaves: Lanceolate to oblong-lanceolate, 5-20 mm wide, 5-10 cm long, tapering toward each end, entire or sometimes sparingly denticulate, obscurely pinnately veined. Flowers: Heads numerous in corymbose cymes, radiate, pedicels stipitate-glandular, involucres hemispherical, 6-8 mm high, bracts linear to narrowly oblong, subequal, greenish and loose to slightly spreading at tips; ray flowers 12-19, ligules yellow, 4-5 mm long, about equaling tubes; disk flowers 40-60, golden yellow. Fruits: Cypselae oblong, compressed, those of rays glabrous, devoid of pappus; disk cypselae sparingly stiff hairs, with a very short, toothed, coroniform pappus on outer ones, inner usually with 4-8 longer, stiff paleae. Ecology: Found along arroyos, alluvial, and saline soils from 1,000-5,500 ft (305-1676 m); flowers August-October. Notes: This plant should be collected where it is appropriate to improve understanding of its distribution. Ethnobotany: Unknown Etymology: Xanthocephalum is from a Greek name meaning that which is dyed yellow and the word for head, while gymnospermoides means naked seed. Synonyms: Grindelia gymnospermoides, Gutierrezia gymnospermoides Editor: SBuckley, 2010
Xanthocephalum gymnospermoides image
Liz Makings  
Xanthocephalum gymnospermoides image
Liz Makings  
Xanthocephalum gymnospermoides image
Patrick Alexander  
Xanthocephalum gymnospermoides image
Liz Makings  
Xanthocephalum gymnospermoides image
Patrick Alexander  
Xanthocephalum gymnospermoides image
Patrick Alexander  
Xanthocephalum gymnospermoides image
Patrick Alexander  
Xanthocephalum gymnospermoides image
Patrick Alexander  
Xanthocephalum gymnospermoides image
Ana L. Reina-Guerrero  
Xanthocephalum gymnospermoides image
Anthony Mendoza  
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Liz Makings  
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image
Xanthocephalum gymnospermoides image