Buchnera americana L. - Blue Hearts
Family - Scrophulariaceae
Stems - To +/-60cm tall, simple, erect, herbaceous, purple above, scabrous (hispidulous), weakly 4-angled to terete.
Leaves - Opposite, sessile, lanceolate, with few coarse serrate teeth, scabrous, acute, to 6cm long, +/-1.5cm broad, with 3 conspicuous main veins arising from base of blade, decussate.
Inflorescence - Terminal spike to -15cm long. Flowers decussate to alternate on axis. Each flower subtended by 3 scalelike bracts. Central bract lance-ovate, to 5mm long. Lateral bracts (bractlets) linear, 3mm long. All bracts scabrous.
Flowers - Corolla 5-lobed, purple, zygomorphic, salverform. Corolla tube to 1.4cm long, pubescent, white below (in calyx), purple above, bearded internally and at apex of throat with multicellular hairs. Largest corolla lobes to 9mm long, 3-4mm broad, often notched at apex. All lobes pubescent internally and externally. Stamens 4, adnate at lower 1/4 of corolla tube, subequal, included. Filaments greenish, 1.1m long, glabrous. Anthers purple, 2mm long. Style green, glabrous, included, to 3mm long. Ovary superior, cylindric, green, glabrous, 3mm long. Placentation free central, ovules many. Calyx tube to 6mm long in flower, antrorse strigose, 5-lobed, 10-nerved. Lobes acute, 1.5-2mm long. Calyx accrescent.
Flowering - June - September.
Habitat - Prairies and limestone glades.
Origin - Native to U.S.
Other info. - This species
can be found in the lower 1/2 of Missouri and is relatively infrequent.
It can be found in dry to wet areas of the habitats mentioned above. The
flowers are quite showy and the plant is worthy of cultivation. It grows
fine from seed.
Photographs taken at Taberville Prairie, MO., 6-16-05.