21. Another surprise was Polygonum cuspidatum Crimson Beauty, a Mexican bamboo that clumps, instead of walking. 22. "Polygonum fowleri " is a prostrate to ascending herb, often with zigzagged stems. 23. "Polygonum striatulum " is a perennial herb that spreads by means of underground rhizomes. 24. "Polygonum engelmannii " is an branching herb up to 30 cm ( 1 foot ) tall. 25. In trampled areas where past livestock congregated, Himalayan knotweed " Polygonum polystachium " is a rampant weed. 26. The oldest name available for this species is " Polygonum persicaria ", coined by Carl Linnaeus in 1753. 27. Your invader is probably the weed Polygonum japonicum, formerly P . cuspidatum and commonly known as Japanese knotweed or Mexican bamboo. 28. By 8 April Gray could not walk; he died on 17 April of dysentery at a place they called Polygonum Swamp. 29. "Polygonum heterosepalum " is a short herb up to tall, forming mats that seem rather moss-like. 30. "Polygonum achoreum " is an herb up to tall with yellow-green flowers in flat-topped clusters.
