Ambrosia ilicifolia (A. Gray) W.W. Payne  
Family: Asteraceae
hollyleaf burr ragweed,  more...
[Franseria ilicifolia A. Gray]
Ambrosia ilicifolia image
Dean Wm. Taylor  
Shrubs, 30-50(-120+) cm. Stems erect. Leaves mostly alternate; petioles 0-2 mm; blades (green) elliptic to ovate, 25-60+ × 12-35+ mm, bases rounded to truncate, margins spiny-toothed, abaxial and adaxial faces ± hirtellous (on veins) and stipitate-glandular. Pistillate heads clustered, proximal to staminates; florets 2. Staminate heads: peduncles 2-8(-12) mm; involucres ± saucer-shaped, 9-15+ mm diam., ± hirtellous and stipitate-glandular; florets 20-40+. Burs: bodies ± globose, 6-8 mm, stipitate-glandular, spines 40-50+, scattered, subulate, 4-6 mm, tips straight or ± uncinate. 2n = 36. Flowering Jan-Apr. Sandy washes, benches; 30-500 m; Ariz., Calif.; Mexico (Baja California, Sonora).
Plant: Shrub < ± 1 m, matted; stems greenish when young, densely glandular and stiffly short-hairy; older bark gray-white Leaves: 2-10 cm, ovate to round, leathery, brittle, dark gray-green, sticky, veiny below; teeth long, spine-tipped; sessile, ± clasping INFLORESCENCE: flower-like heads; staminate heads 10-15 mm diam, involucre lobes 10-15, lanceolate, spine-tipped; phyllaries fused into shallow cup; pistillate heads generally 2-flowered; receptacle chaffy; chaff scales spirally arrayed, fused below, tips generally becoming spiny Flowers: Staminate flowers ± many; corolla yellow or translucent; anthers free; style unbranched; Pistillate flowers 1-5; corolla 0; style branches long Fruit: Fruit: enclosed in a bur < 20 mm, spheric, ± brown, sticky; spines 20-70, scattered, < 6 mm, ± cylindric, strongly hooked Misc: Sandy washes, rocky canyons, creosote-bush scrub; < 500 m.; Feb-Apr
Ambrosia ilicifolia image
Sue Carnahan  
Ambrosia ilicifolia image
Karen Reichhardt  
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Shannon Henke  
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Shannon Henke  
Ambrosia ilicifolia image
Matthew Hulen  
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Ambrosia ilicifolia image
Shannon Henke