Helianthus strumosus (Pale-Leaved Woodland Sunflower)

helianthus_strum_rudbeckia_mollis

no standard photo
Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner’s Sons, New York. Vol. 3: 485. Provided by Kentucky Native Plant Society. Scanned by Omnitek Inc.

Where Commonly Found: Woodlands, clearings and fields., CT, MA, ME NH, NY, RI, VT (rare in 4 counties, DO NOT COLLECT WHERE IT IS RARE).  There are 20 some Helianthus species with yellow/gold disks in the US, so key carefully!

How to Identify:
(For unfamiliar words: Wikipedia Glossary of Botanical Terms).
Go Botany Key for Helianthus strumosus.
Minnesota Wildflower’s website description of Helianthus strumosus For more images.

Flower Color:  Gold
Flower Type:  Radial petals, 8-15 yellow rays with a gold central disk, 
flowerheads  in loose clusters at stem ends.  Flowerheads are 1-1/2″ – 4″” wide, green bracts below flowerhead are equal to or shorter than disk.
Flower Time:  July – September.
Leaf Arrangement:  Opposite on long-stalked and narrowly branched stems.  Upper leaves are sometimes alternate.  Petioles are 1/4″-1″ long.  Stems are smooth or slightly hairy below flowerheads.
Leaf Type:   Simple, 3″ – 8″ long, lanceolate or oval, rough upper surface and often whitish downy on lower surfaces, finely toothed.
Height:  2′-6′
Seed Collection:  Nutlets, mature 2-3 weeks after flowering, collect whole seed head, air dry, then separate nutlets from chaff.

Attracts:  Bees and Birds
Use:  Naturalizing.
Light: Sun to Shade
Hardiness Zone:  ___  USDA Zone Map
Soils: Dry to Medium
Notes:  Somewhat shade tolerant tall sunflower, nice in open woodlands.
Native to East, Midwest and South US (rare in four VT counties)  DO NOT COLLECT WHERE IT IS RARE:  Biota of North America Program (BONAP) – North American Plant Atlas (NAPA).

 

Requested by Edgewood Nursery.

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