''Polygonum striatulum'', the striped knotweed or Texas knotweed, is endemic to the U.S. state of

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

but cultivated as an ornamental elsewhere. It occurs there in sterile prairies, granitic soils, and in places that are seasonally moist, at elevations of .Flora of North America ''Polygonum striatulum'' B. L. Robinson, 1904. Texas knotweed
/ref> ''Polygonum striatulum'' is a perennial herb that spreads by means of underground

rhizomes In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...

. Leaves are

lanceolate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular o ...

, up to long, the leaves in the upper part of the plant decidedly larger than those closer to the ground. Inflorescences are at the top of the plant and also at the tips of branches, each with 2–6 white to pinkish flowers.Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.

References

{{Taxonbar, from=Q15599128 striatulatum Flora of Texas Plants described in 1904