Lithospermum incisum Lehm.
Yellow Puccoon, Fringed Gromwell
Family - Boraginaceae
Stem - To 40 cm, ascending to erect, sometimes branched, densely pubescent with stiff, antrorse-appressed hairs.
Leaf - 2-7 cm long, 3-6 mm wide, linear to narrowly lanceolate, relatively thick, moderately to densely pubescent with short, stiff, antrorse-appressed hairs, grayish green, without noticeable lateral veins.
Inflorescence - Dense terminal clusters.
Calyx - Actinomorphic, 5-lobed, 6-12 mm long, hairy.
Flower - 2.5-4.0 cm long, salverform, yellow, with fringed or corrugated corolla lobes. Corolla tube 15-30 mm long, with stamens inserted near tip.
Fruit - Nutlets plump, white, shiny, with constricted bases. Said to resemble small teeth.
Flowering - April - June.
Habitat - Glades, upland and loess hill prairies, tops of bluffs.
Origin - Native to North America.
Other info - This species is (usually) easily recognized by the very long corolla tubes and ruffled lobes. However, there is also a later cleistogamous flowering phase which is considerably different in appearance. The plant is somewhat more common in the western half of the state.
Photographs taken in Danville Conservation Area, Montgomery County, MO, 4-18-2017 (SRTurner).