Stylisma pickeringii var. pattersonii (Fernald & B.G. Schub.) Myint

Stylisma

Stylisma pickeringii plant

Family - Convolvulaceae

Stem - Prostrate, scrambling but not twining, to 2 m, pubescent with appressed branched hairs.

Stylisma_pickeringii_stemStem and leaves.

Leaves - Alternate, sessile or short petiolate, simple, entire, broadly linear, to 6 cm long, glabrous or pubescent.

Stylisma_pickeringii_leavesLeaves.

Stylisma_pickeringii_leafLeaves.

Inflorescence - Axillary, solitary or in loose clusters, long-stalked.

Stylisma_pickeringii_flowerFlowers.

Calyx - Sepals 5, free, to 6 mm long, ovate or elliptic, densely pubescent.

Stylisma_pickeringii_calyxCalyx.

Flowers - Corollas shallowly 5-lobed, to 1.8 cm long, broadly funnel-shaped. Stamens 5, exserted from corolla. Styles 1, with 2 unequal lobes toward tip. Ovary 2-locular with 4 ovules, densely hairy.

Stylisma_pickeringii_corollaCorolla.

Fruits - 5-9 mm long, ovoid, 1- or 2-locular, dehiscing longitudinally into 2-4 segments.

Stylisma_pickeringii_fruitImmature fruits.

Flowering - June - September.

Habitat - Sand prairies or other areas with sandy substrate.

Origin - Native to the U.S.

Other info. - This interesting member of the morning glory family was first documented in Missouri only in 1989, and is currently known in the state from only two counties (Clark and Scott). It is highly specific to sand prairies, though it can apparently persist after degradation or destruction of the original habitat. The Missouri populations are somewhat disjunct from the main natural range of the plant, which is a band through central Oklahoma and eastern Texas.
In addition to the var. pattersonii found in Missouri, Myint has also described a second variety found in the southeastern coastal plain, differing in details of the sepals and style branches.

Photographs taken at Sand Prairie Conservation Area, Scott County, MO, 6-17-2013 and 7-30-2015 (SRTurner).



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