Matelea baldwyniana (Sweet) Woodson
Family - Asclepiadaceae
Stems - Twining, climbing, herbaceous, brownish, with milky sap, hirsute and with glandular pubescence (some hairs with swollen glandular bases), from thickened roots.
Leaves - Opposite, petiolate. Petiole 5-6cm long, with same pubescence as stem. Blade to +/-13cm long. +/-10cm broad, broadly ovate to orbicular, cordate, entire, acute to acuminate, scabrous above from swollen pubescence, appearing punctate because of swollen hairs.
Inflorescence - Axillary umbellate cymes with +15 flowers. Peduncles to 6cm long. Pedicels to +2cm long. Peduncles and pedicels with same pubescence as stem.
Flowers - Corolla white, 5-lobed. Lobes twisting, +/-1.2cm long, 2-3mm broad, with same pubescence as stem externally, glabrous internally, blunt to slightly emarginate. Corona 5-lobed. Lobes to .5mm long, alternating with appendages. Appendages to .8mm long, often bifurcate. Pollinia minute, +/-.1mm broad, .3mm long, with dark reddish-brown translator. Anther head discoid, +/-1.3mm broad (diameter). Calyx 5-lobed. Lobes 3-4mm long, lanceolate, spreading to slightly recurved, densely brown glandular. Follicles to 9cm long, tuberculate. Seeds ovate, to 9mm long. Coma to +3cm long, tan.
Flowering - May - June.
Habitat - Moist ground of rocky open woods and thickets. Also on glades.
Origin - Native to U.S.
Other info. - This is one of 4 species of the genus found in Missouri. This plant prefers moist ground and is found mostly in the southwest corner of the state.
Photographs taken at Busiek State Forest, MO., 6-17-05.