Image ID: 9574
Image by: Ware, Richard & Teresa
Image Collection: NCBG Digital Library
SCIENTIFIC NAME: Silphium compositum
Include in WOTAS: 1
Publish to Web: 1
Last Modified: 2019-01-25
GENUS CODE: SILPH GENUS SCIENTIFIC:Silphium GENUS AUTHORITY: L. GENUS COMMON: Rosinweed GENUS SUMMARY: A genus of 20-30 species, herbs, of e. North America. GENUS IDENTIFICATION: Identification notes: The number of ray flowers per head is a useful taxonomic character in Silphium; since only ray flowers are fertile, the number of ray flowers can also be estimated by the number of achenes in freshly fruiting material. The key and taxonomic treatment is provisional. GENUS REFERENCES: Sweeney (1970)=Z; Perry (1937)=Y; Clevinger in FNA (2006c); Clevinger (2004)=X; Cronquist (1980)=SE; Cruden (1962); Medley (1989); Steyermark (1951).
FAMILY CODE: ASTERA FAMILY SCIENTIFIC:Asteraceae FAMILY AUTHORITY: Dumortier 1822 or COMPOSITAE Giseke 1792 FAMILY COMMON: Aster Family FAMILY SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution. FAMILY REFERENCE: Cronquist (1980)=SE throughout family treatment.
INTRO: Large, erectperennial of dry woodlands, clearings, meadows, sandhills and road banks. STEMS: Stems flexible and wand-like, leafy toward base, with only a few leaf-like bracts above, smooth, often with a white-waxy coating. LEAVES: Leaves alternate but clustered near base of stem, long-petiolate, oval to kidney-shaped but toothed to deeply pinnately lobed, to 14 in. long (reduced upward), often with a red mid-vein, thick, smooth or hairy. INFLORESCENCE: FLOWERS:Composite flowers (heads) in a loosely forking, terminal cluster; heads to 2 in. wide, consisting of 6-12 bright yellow ray florets encircling a center disk of 20 or more tiny, dull yellow, tubular florets. Several series of green, broadly oval bracts surround the cup-like base of each head. FRUITS: COMMENTS: Silphium compositum var. ovatifolium and Silphium compositum var. venosum . . . ? HEIGHT: 1.5-8 ft. DURATION:
Alternate LEAF COMPLEXITY: LEAF RETENTION: FLORAL CHARACTERISTICS
BLOOM TIME: May-September
BLOOM COLOR: Yellow
FRUITING PERIOD: DISTRIBUTION
HABITAT TYPE: Dry forests, Sandhills, Woods margins
NATIVE RANGE: southeastern United States HORTICULTURAL
Plant Sale Text: Rosinweed is a long-lived southeastern native perennial. It is found growing at the edges of woodlands and in old fields, primarily in the piedmont and coastal plain. Rosinweeds are adept at surviving drought and even fire once they are well established, due to their thick tap-roots. This is a wonderful perennial for attracting butterflies, because its nectar-producing flowers open over many weeks. The seeds that follow are a favorite food of goldfinches.
Bloom Table Text:
MINIMUM HARDINESS ZONE: 5
MAXIMUM HARDINESS ZONE: 9
GERMINATION CODE: 2
Bee Friendly, Butterfly Friendly, Bird Friendly
USDA Symbol: SICO5
USDA Common Name: Kidneyleaf Rosinweed
Native Status: L48 (N)
Distribution: USA (AL, FL, GA, NC, SC, TN, VA, WV)
Growth Habit: Forb/herb
Key to Map SymbolsABOUT FAMILY (Weakley Flora) Asteraceae Dumortier 1822 or COMPOSITAE Giseke 1792 (Aster Family) SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution. REFERENCE: Cronquist (1980)=SE throughout family treatment.ABOUT GENUS (Weakley Flora) Silphium L. (Rosinweed) SUMMARY: A genus of 20-30 species, herbs, of e. North America. REFERENCE: Sweeney (1970)=Z; Perry (1937)=Y; Clevinger in FNA (2006c); Clevinger (2004)=X; Cronquist (1980)=SE; Cruden (1962); Medley (1989); Steyermark (1951).
SERNEC: Find Silphium compositum in Southeast Regional Network of Experts and Collections (if available) UNC SERNEC: Find Silphium compositum in
University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)