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GERMINATION REQUIREMENTS OF SEEDS OF HELIANTHUS PARADOXUS (ASTERACEAE).

Abstract.-- This study examined the germination requirements of the seeds of the rare annual Helianthus paradoxus (puzzle sunflower), which is known to occur in only two locations in west Texas and a few locations in New Mexico. Flowering and seed (achene) maturation of H. paradoxus occurs in late fall (October and November) and seeds are released from the flower head shortly after maturation. Newly matured seeds of H. paradoxus are dormant and will not germinate. Seeds require one to three months of afterripening or dry storage at 4-25[degrees]C. With storage at 38[degrees]C, seed germination remains low at about 5% even after 10 months of storage. After appropriate storage, ...

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