Pacific Island Ecosystems at Risk (PIER)

  [   PIER species lists  ]   [   PIER home  ]

Schizachyrium scoparium
(Michx.) Nash, Poaceae
Click on an image for links to BIGGER PICTURES


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Andropogon scoparius Michx.

Common name(s): [more details]

English: little bluestem, prairie beardgrass

Habit:  grass

Description:  "Habit: Perennial; caespitose. Rhizomes absent, or short. Culms 50-150 cm long. Lateral branches ample. Leaf-sheaths keeled; glabrous on surface to hirsute. Ligule an eciliate membrane; 1-3 mm long. Leaf-blades 15-30 cm long; 3-6 mm wide. Leaf-blade surface glabrous to hirsute. Leaf-blade apex acute. Synflorescence compound; linear. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; exserted. Spatheole linear; 4-6 cm long; herbaceous. Racemes 1; single; sinuous; 3-6 cm long. Rhachis fragile at the nodes; semiterete; ciliate on margins, or villous on margins. Rhachis internodes clavate. Rhachis internode tip cupuliform; with scarious rim. Spikelets ascending, or spreading; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; curved; ciliate, or villous. Sterile spikelets: Companion sterile spikelets represented by single glumes, or well-developed; comprising 2 subequal glumes without lemmas, or containing empty lemmas, or male; lanceolate; dorsally compressed; 1.5-7 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes chartaceous; muticous, or awned; one glume awned; with 1.5-3 mm long awn. Companion sterile spikelet lemmas 2; enclosed by glumes. Fertile spikelets: Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 6-8 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pilose; base obtuse; inserted. Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 times length of spikelet; coriaceous; 2-keeled; keeled all along; keeled laterally; keeled obtusely. Lower glume intercarinal veins distinct; 3 in number. Lower glume surface flat, or concave. Upper glume lanceolate; membranous; 1-keeled. Florets: Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 2 -veined. Fertile lemma oblong; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; with lanceolate lobes; incised 0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 8-15 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute"  (GrassBase).

"May be distinguished from S. condensatum by the following characters: culms densely tufted, 50-150 cm tall, erect, often glaucous, branching distally, sheaths and blades glabrous or blades long pilose towards base, blades 9-20 x 3-4 mm; inflorescence with racemes 3-6 cm long, mostly curved, the peduncles filiform, mostly included in the sheaths, often spreading, the rachis slender, flexuose, pilose; sessile spikelets 6-8 mm long, scabrous, the awn 8-15 mm long, twisted, minutely scabrid; pedicellate spikelet reduced, short-awned, spreading, the pedicel pilose"  (Lorence & Flynn, 1995).

Habitat/ecology:  (no habitat/ecology info known by PIER)

Propagation:  Seed

Native range:  Canada, United States and northern Mexico (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Lorence, David H./Flynn, Timothy W./Wagner, Warren L. (1995) (pp. 47-48)
"Pasture land and secondary forest". Voucher cited: T. Flynn & L. Hume 3220 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
Maui Island introduced
cultivated
Herbst, Derral R./Clayton, W. D. (1998) (p. 35)
Voucher cited: Hosaka 2459 (BISH)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
cultivated
Herbst, Derral R./Clayton, W. D. (1998) (p. 35)
Vouchers cited: Hosaka 2620 (BISH), Nagata & Takeuchi 3743 (BISH), Nagata & Takeuchi 3750 (BISH)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

  [   PIER species lists  ]   [   PIER home  ]

This page was created on 11 FEB 2007 and was last updated on 8 JUL 2012.