STIFF SUNFLOWER
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File Size: 70 KB |
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Helianthus pauciflorus Nutt.
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[=Helianthus rigidus (Cass. ) Desf.] |
Riley County, Kansas |
Perennial |
Height: 1-7 feet |
Family: Asteraceae - Sunflower Family |
Flowering Period: July, August, September |
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Stems: | | Erect, simple or sparsely branched above, green or often reddish, rough-hairy. | Leaves: | | Variable, widely separated, mostly opposite, stalked below, nearly sessile above, ovate to narrowly oblong-lanceolate, 2 to 12 inches long, 1 to 2.5 inches wide, thick, rough, leathery, gray-green; margins toothed to nearly entire; tips pointed; often folded lengthwise; uppermost leaves bract-like and sometimes alternate. | Inflorescences: | | Heads, solitary or several, long-stalked, terminal, 2.5 to 4 inches wide; bracts elliptic to ovate, conspicuously overlapping in several series, pressed tightly against disk, glabrous, margins fringed with stiff hairs; tips pointed to blunt. | Flowers: | | Ray florets 10-25, to 1.5 inch long, yellow; disk florets numerous, corollas purplish brown to sometimes yellow with reddish lobes. | Fruits: | | Achenes, about 1/4 inch long, mostly glabrous, tipped with 2 conspicuous bristles and smaller secondary scales, enclosing small seed. | Habitat: | | Dry or drying prairies, roadsides, and open woods, most abundant in sandy soils. | Distribution: | | East 1/2 of Kansas. | Comments: | | Stiff sunflower forms colonies by rhizomes and is one of our earliest blooming sunflowers. The primary roots grow more than 7 feet long. |
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Stiff sunflower | ![](thumbnails/stiffsun12.jpg) | 64 KB | Marshall County, Kansas |
| Stiff sunflower leaf | ![](thumbnails/rigidsunleaf.jpg) | 79 KB | Chase County, Kansas |
| Stiff sunflower involucral bracts | ![](thumbnails/stiffsun6.jpg) | 64 KB | Riley County, Kansas |
| Stiff sunflower leaves | ![](thumbnails/stiffsunleaves.jpg) | 108 KB | Marshall County, Kansas |
| Stiff sunflower | ![](thumbnails/stiffsun14.jpg) | 52 KB | Marshall County, Kansas |
| Stiff sunflower leaves | ![](thumbnails/stiffsun11.jpg) | 140 KB | Marshall County, Kansas |
| Stiff sunflower | ![](thumbnails/stiffsun15.jpg) | 164 KB | Marshall County, Kansas |
| Stiff sunflower leaf | ![](thumbnails/rigidsunleaf2.jpg) | 70 KB | Riley County, Kansas |
| Stiff sunflower head | ![](thumbnails/stiffsun4.jpg) | 64 KB | Riley County, Kansas |
| Stiff sunflower leaves | ![](thumbnails/stiffsunleaves3.jpg) | 152 KB | Riley County, Kansas |
| Stiff sunflower leaf | ![](thumbnails/stiffsunflowerleaf3.jpg) | 72 KB | Morris County, Kansas |
| Stiff sunflower florets | ![](thumbnails/stiffsun22.jpg) | 87 KB | Riley County, Kansas |
| Stiff sunflower habit | ![](thumbnails/stiffsun24.jpg) | 191 KB | Riley County, Kansas |
| Stiff sunflower florets | ![](thumbnails/stiffsun25.jpg) | 87 KB | Riley County, Kansas |
| Stiff sunflower habit | ![](thumbnails/stiffsun26.jpg) | 201 KB | Riley County, Kansas |
| Stiff sunflower | ![](thumbnails/stiffsun28.jpg) | 128 KB | Riley County, Kansas |
| Stiff sunflower leaf | ![](thumbnails/stiffsunleaf.jpg) | 95 KB | Riley County, Kansas |
| Stiff sunflower heads | ![](thumbnails/stiffsun27.jpg) | 99 KB | Riley County, Kansas |
| Stiff sunflower | ![](thumbnails/stiffsun29.jpg) | 112 KB | Riley County, Kansas |
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