| 词条 | Perideridia howellii |
| 释义 |
|regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Apiales |familia = Apiaceae |genus = Perideridia |species = P. howellii |binomial = Perideridia howellii |binomial_authority = (J.M.Coult. & Rose) Mathias }}Perideridia howellii is a species of flowering plant in the carrot family known by the common name Howell's yampah.[1] It is native to the mountains of Oregon and northern California, where it grows in moist soils, often near streams and rivers.[2] It is a perennial herb which may exceed 1.5 metres in maximum height, its slender, erect stem growing from a cluster of many narrow fibrous roots measuring up to 15 centimetres long.[2] Leaves near the base of the plant have lance-shaped blades up to half a metre long which are divided into many leaflets made up of toothed, oval segments.[2] Leaves higher on the plant are similar, but generally smaller. The inflorescence is a compound umbel of many spherical clusters of small white flowers.[2] These yield ribbed, oblong-shaped fruits each about half a centimetre long.[2] References1. ^USDA Plants Profile 2. ^1 2 3 4 Jepson Manual Treatment External links
3 : Perideridia|Flora of California|Flora of Oregon |
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