- The plant pictured above is one of the many cultivated varieties of
. These varieties range in size from shorter than a meter to over 2.5 meters. Many of the cultivated plants do not grow true from seed and will eventually revert back to the wild type plants over a few generations. To view the wild type plant click
The largest of these cultivated
get massive taproots that exceed 2.5m in length. The taller plants often need to be staked as the large flower heads weigh too much for the stem to support.
Cultivated sunflowers are the plants from which birdseed, sunflower oil, and our edible sunflower seeds arise. These cultivated plants do not readily escape in Missouri.
The lower-most leaves of the stem on this species are opposite but quickly become alternate for the rest of the stem length. Seedling plants have opposite leaves.
Photographs taken at the Peck Ranch Wildlife Refuge, Carter County, MO., 7-12-03.
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Robert H. Mohlenbrock. USDA SCS. 1991.
Southern wetland flora: Field office guide to plant species
. South National Technical Center, Fort Worth. Provided by USDA NRCS Wetland Science Institute (WSI).
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all
Federal and State Noxious Weeds
This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of
Weeds of the U.S.
Linnaeus, Sp. Pl. 2: 904. 1753.
(Douglas ex Lindley) Cockerell;
(Douglas ex Lindley) Steyermark;
(de Candolle) Cockerell;
Douglas ex Lindley;
erect, usually hispid.
mostly cauline; mostly alternate; petioles 2—20 cm; blades lance-ovate to ovate, 10—40 × 5—40 cm, bases cuneate to subcordate or cordate, margins serrate, abaxial faces usually ± hispid, sometimes gland-dotted
hemispheric or broader, 15—40(—200+) mm diam.
20—30(—100+), ovate to lance-ovate, 13—25 × (3—)5—8 mm, (margins usually ciliate) apices abruptly narrowed, long-acuminate, abaxial faces usually hirsute to hispid, rarely glabrate or glabrous, usually gland-dotted.
9—11 mm, 3-toothed (middle teeth long-acuminate, glabrous or hispid).
(13—)17—30(—100+); laminae 25—50 mm.
150+(—1000+); corollas 5—8 mm (throats ± bulbous at bases), lobes usually reddish, sometimes yellow
anthers brownish to black, appendages yellow or dark (style branches yellow)
(3—)4—5(—15) mm, glabrate
of 2 lanceolate scales 2—3.5 mm plus 0—4 obtuse scales 0.5—1 mm.
is widely distributed, including weedy, cultivated, and escaped plants. It is the only native North American species to become a major agronomic crop. Despite its considerable variability, attempts have failed to produce a widely adopted infraspecific system of classification. Forms with red-colored ray laminae, known from cultivation and occasionally seen escaped, trace their ancestry to a single original mutant plant. It hybridizes with many of the other annual species.
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Using the Photos in CalPhotos