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- Identification of Tropical Spiderwort (AKA Benghal Dayflower) Theodore M. Webster USDA-ARS, Tifton Twebster@tifton.usda.gov
- Eric Prostko, UGA Coteledonary stalk – links seed to meristem (common in Commelinaceae)
- Photo by Stanley Culpepper, UGA Relative to other dayflowers, tropical spiderwort has broad, short leaves
- Leaf Length: Leaf Width ~ 1.5 (Less than 3:1) Alan York, NCSU Of the 170 Commelina spp., it is one of a few that is vegetatively distinct (Faden 1992)
- TROPICAL SPIDERWORT Tip more blunted L:W Ratio <3:1 SPREADING DAYFLOWER Tip sharper L:W Ratio >4:1 Mike Burton, NCSU 4.3 1.0 1.5 1.0 MARSH DAYFLOWER L:W Ratio ~ 6:1
- Red Hairs at the apex of the membranous sheath Herb Pilcher, USDA-ARS
- Dayflower/Spiderwort Flowers (Commelina spp.) Asiatic Dayflower Spreading Dayflower Tropical spiderwort From SWSS Weed ID Guide From SWSS Weed ID Guide This slide is a bit deceiving, as tropical spiderwort flowers are much smaller than its two dayflower relatives Herb Pilcher, USDA-ARS 3 blue petals Upper 2 petals blue Lower petal white
- Fused Conical Spathe: Important Identifying Characteristic! Mike Burton, NCSU Top View: Spreading Dayflower Side View: Spreading Dayflower
- Fused Not Fused Asiatic Dayflower Tropical Spiderwort
- Of the nearly 250,000 species of flowering plants… … 36 have underground flowers Herb Pilcher, USDA-ARS Only dayflower species in the U.S. to have underground flowers
- Underground flowers 2002 Arlene Mendoza North Carolina State University
- Key Characteristics for Tropical Spiderwort Identification Leaf Length to Leaf Width Ratio <3:1; other dayflowers are 4:1 or greater Underground flowers – unique among dayflowers in the US Aerial flowers are much smaller than other dayflowers; 2 upper petals blue, lower one white Red (or white) hairs at the apex of the sheath that surrounds the stem
- Contact Information Twebster@tifton.usda.gov
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