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Key to Asclepias, Key C: milkweeds with milky sap, with sessile, nonlinear leaves
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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40364
1 Leaves 2-5 cm long, 0.3-1.0 cm wide; corolla lobes erect, creamy yellow to greenish white, 7-10 mm long; plant 1-4 dm tall; [of dryish pinelands of the Coastal Plain, e. NC to s. FL, west to FL Panhandle] | |
3 Plant prostrate or decumbent; leaves blue-green with conspicuous pink veins throughout; inflorescence usually with numerous axillary umbels present (occasionally plants with a solitary terminal umbel); [dry pinelands of the southeastern coastal plain; NC to FL, w. to e. LA] | |
3 Plant erect, not falling over and laying on the ground; leaves green, not blue-tinted, with pink midribs but lacking conspicuous secondary or tertiary pink veins; umbels solitary and terminal or with a few umbels concentrated terminally or in the upper most leaf axils; [collectively widespread] | |
6 Leaves lanceolate, acuminate at the apex; corolla reddish purple to pink, the lobes 7-9 mm long; [of wetlands, Coastal Plain and very rarely inland] | |
7 Flowers primarily green-colored; plants usually with solitary terminal umbels nodding; [upland prairies; rare from s. MO and s. IL n. to nw. IN and sw. IA] | |
7 Flowers primarily pink-colored; plants often with more than one umbel and usually oriented upright; [wet habitats and seepages of the Coastal Plain; NJ to FL, w. to TX] | |