Sporobolus clandestinus

Species category

Weed

Common name

rough dropseed

Diagnostic characters

Planting unit

FloretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.

Shape

Lanceolate

Size

  • Length 6.5–7 mm
  • Width 1–1.2 mm
  • Thickness 0.5–0.6 mm

Color

Brown with black mottling on floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
Caryopsis brown with dark scutellumScutellum:
A shield-shaped highly modified, single cotyledon in grasses (Poaceae) that absorbs nutrients from the endosperm and provides energy for germination.

Texture

CaryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
is translucent and finely striate. LemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
and paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.
are sparsely pubescentPubescent:
Having hairs.
.

Lemma

Long, pointed and mottled

Palea

Protruding from lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
and 2/3 the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
length

Other structures

EmbryoEmbryo:
A rudimentary plant contained in a seed, usually consisting of a more or less differentiated axis and attached cotyledon(s).
is dark; caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
is laterally compressed.

Identification notes

The floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
is mostly seen. It is longer and more pointed than found in most Sporobolus sp. The dark pigmented scutellumScutellum:
A shield-shaped highly modified, single cotyledon in grasses (Poaceae) that absorbs nutrients from the endosperm and provides energy for germination.
found here is found in others of the same genera.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

More information

For more information, see ISMA fact sheet, Sporobolus spp.

Nomenclature

Family

Poaceae

Valid name

Sporobolus clandestinus (Biehler) Hitchc.

Synonyms

Sporobolus asper (P. Beauv.) Kunth var. canovirens (Nash) Shinners
Sporobolus asper (P. Beauv.) Kunth var. clandestinus (Biehler) Shinners
Sporobolus canovirens Nash
Sporobolus clandestinus (Biehler) Hitchc. var. canovirens (Nash) Steyerm. & Kucera 
Sporobolus compositus (Poir.) Merr. var. clandestinus (Biehler) Wipff & S.D. Jones
Sporobolus longifolius (Torr.) Alph. Wood

From Left to Right: 1. Bottom.  Sporobolus neglectus  2. Bottom.  Sporobolus airoides  3. Bottom.  Sporobolus clandestinus  4. Top.  Sporobolus compositus  5. Top.  Sporobolus giganteus  6. Top.  Sporobolus cryptandrus.
From Left to Right: 1. Bottom. Sporobolus neglectus 2. Bottom. Sporobolus airoides 3. Bottom. Sporobolus clandestinus 4. Top. Sporobolus compositus 5. Top. Sporobolus giganteus 6. Top. Sporobolus cryptandrus.
 Sporobolus clandestinus.  Florets with a dark embryo and a laterally compressed caryopsis.
Sporobolus clandestinus. Florets with a dark embryo and a laterally compressed caryopsis.