Fl. Bor.-Amer. 2: 164, plate 44 [as Podostemon]. 1803

Common names: Threadfood riverweed orchid-of-the-waterfall
Etymology: Greek podos, foot, and stemon, stamen, alluding to stamens elevated on foot-stalk (andropodium)
Treatment appears in FNA Volume 6. Treatment on page 70.
Roots green, photosynthetic; haptera (fleshy disclike or fingerlike outgrowths) arising along flanks of roots serving as anchorage. Leaves with 1–2 basal sheaths; stipules extensions of boat-shaped leaf base; petiole round to elliptic; blade symmetric, ultimate divisions linear, awl-shaped, or spatulate, apex rounded, blunt, acute, or apiculate. Inflorescences apical or lateral, 1–12-flowered, pedicellate; spathella clavate, smooth or papillate, apex rounded or with nipple, rupturing apically into 1–6 irregular segments. Pedicels expanded at apex, elongating during anthesis. Flowers zygomorphic; tepals scalelike, 2 at base of ovary on either side of andropodium (lateral tepals), shorter than ovary, 1 (andropodial tepal) arising at top of andropodium from fork between 2 stamen filaments; anthers basifixed, quadrangular; thecae equal or inner longer than outer, apices rounded, distinct, dehiscence introrse; ovary oriented obliquely on pedicel, 2-locular, ellipsoidal; ovules 25–200; placentation axile; stigmas distinct, simple, bent toward anthers prior to spathella rupture, divergent and elongating during anthesis. Capsules 2-locular, persistent valve oriented obliquely on pedicel, each valve 3-ribbed, suture margins thickened, riblike. Seeds 0–42[–203].


c, e North America, Mexico, West Indies (Dominican Republic), Central America, South America.


Species 11 (1 in the flora).

Lower Taxa

Facts about "Podostemum"
AuthorC. Thomas Philbrick + and Garrett E. Crow +
AuthorityMichaux +
Common nameThreadfood +, riverweed + and orchid-of-the-waterfall +
DistributionC +, E North America +, Mexico +, West Indies (Dominican Republic) +, Central America + and South America. +
EtymologyGreek podos, foot, and stemon, stamen, alluding to stamens elevated on foot-stalk (andropodium) +
IllustratorJohn Myers +
Publication titleFl. Bor.-Amer. +
Publication year1803 +
Referencephilbrick1983a +, philbrick1984a +, philbrick1992a +, philbrick2004a + and rutishauser2003a +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse grained fna xml/V6/V6 111.xml +
Taxon familyPodostemaceae +
Taxon namePodostemum +
Taxon parentPodostemaceae +
Taxon rankgenus +
VolumeVolume 6 +