Curlycup Gumweed Flower Curlycup Gumweed Flower Curlycup Gumweed Bud Curlycup Gumweed Leaves Curlycup Gumweed Plant


Wildflowers of Southern Arizona


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Curlycup Gumweed.
Grindelia squarrosa
Aster (Asteraceae) family.

Biennials, perennials, or subshrubs (perhaps flowering first year, usually short-lived), (10-)40-100 cm. Stems erect, usually whitish or stramineous, sometimes reddish or grayish, glabrous. Leaves: cauline leaf blades oval, ovate, obovate, or oblong to spatulate, oblanceolate, lanceolate, or linear, (10-)15-70 mm, lengths 2-5(-10) times widths, bases ± clasping, margins usually crenate to serrate (teeth mostly 3-6+ per cm, rounded to obtuse, resin-tipped), rarely entire, apices obtuse to acute, faces glabrous, strongly gland-dotted. Heads usually in open to crowded, corymbiform arrays, rarely borne singly. Involucres broadly urceolate to hemispheric or globose, 6-11 × 8-20+ mm. Phyllaries in 5-6 series, reflexed to spreading or appressed, filiform or linear to lance-linear or lance-subulate, apices usually looped to hooked, sometimes recurved to nearly straight, subterete to subulate, moderately to strongly resinous. Ray florets 0 or (12-)24-36(-40); laminae 8-14 mm. Cypselae whitish, stramineous, brown, or gray, 1.5-4.5 mm, apices smooth, coronate, or knobby, faces smooth, striate, or ± furrowed; pappi of 2-3(-8), straight or contorted to curled, smooth or barbellulate to barbellate, subulate scales or setiform awns 2.5-5.5 mm, shorter than disc corollas.. Flowering Jul-Sep(-Oct). Disturbed sites, plains, hills, roadsides, along streams, sands, clays, and subalkaline soils; (10-)200-2900 m.

Santa Catalina Mountains
Box Camp Trail
Location: Shoulder of parking lot
7/3/16

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