Hopia

Hopia obtusa is a species of grass commonly known as vine mesquite. This plant was treated as Panicum obtusum until recently when more molecular and genetic material revealed new information about it.[1] Hopia obtusa is now placed in the monotypic genus Hopia.[1]

For the Philippine pastry called hopia, see Bakpia.

Hopia
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Panicoideae
Supertribe: Andropogonodae
Tribe: Paspaleae
Subtribe: Paspalinae
Genus: Hopia
Zuloaga & Morrone
Species:
H. obtusa
Binomial name
Hopia obtusa
(Kunth) Zuloaga & Morrone
Synonyms

Panicum obtusum Kunth

Description

Hopia obtusa is a perennial grass with stems up to 20 to 80 centimetres (7.9 to 31.5 in) tall. It has long, creeping rhizomes or shallow rhizomes with swollen, villous nodes. The culms are usually in small, compressed, glaucous clumps that are either erect or decumbent. Nodes are hairy lower on the plant but glabrous higher up. The sheath is pubescent to pilose lower on the plant but glabrous higher up. It has membranous truncate, irregularly denticulate ligules that are 0.2–2 millimetres (0.0079–0.0787 in) big. Leaf blades are 3–26 cm (1.2–10.2 in) long and 2–7 mm (0.079–0.276 in) wide; they are ascending, firm, glaucous, sparsely pilose near the base, often scabrous on the margins, and involute towards the tips. The panicles are 5–15 cm (2.0–5.9 in) long and 0.8–1.5 cm (0.31–0.59 in) wide. The panicle has 2 to 6 spikelike, erect, puberulent, and 3-angled branches. The ultimate branchlets are one-sided. The pedicels are paired and congested. Some spikelets are on short pedicels that are 0.1–1 mm (0.0039–0.0394 in), while others are on longer pedicels 1.5–2.5 mm (0.059–0.098 in). Spikelets are 2.8–4.4 mm (0.11–0.17 in) long, ellipsoid, terete to slightly laterally compressed, glabrous, and obtuse. The lower glumes are about 3/4 as long as the spikelet and are 5- or 7-veined. Upper glumes and lower lemmas equal the spikelet's length and are 5– to 9-veined. The lower florets are staminate with its lower paleas 2.5–3.5 mm (0.098–0.138 in) long. The upper florets are puberulent at the bases and apices. Flowering is from May through October.[2]

Habitat and Ecology

Hopia obtusa grows in seasonally wet sand or gravel, especially on stream banks, ditches, roadsides, wet pastures, and rangeland. Its range extends from the southwestern United States to central Mexico.[2]

It is a larval host to the dotted roadside skipper.[3]

gollark: A subcase of it?
gollark: Why am I neutral *evil*?
gollark: γρεεκ τρανσλιτερατιον ις φυν.
gollark: It's not a spoiler if you have absolutely no idea what it's about!
gollark: ||T||||h||||i||||s|| ||w||||a||||y|| ||s||||t||||o||||p||||s|| ||y||||o||||u|| ||s||||p||||o||||i||||l||||i||||n||||g|| ||a||||n||||y||||t||||h||||i||||n||||g||||.||

References
  1. Fernando O. Zuloaga, Liliana M. Giussani & Osvaldo Morrone (2007). "Hopia, a new monotypic genus segregated from Panicum (Poaceae)". Taxon. 56 (1): 145–156. JSTOR 25065745.
  2. "Hopia description". Intermountain Herbarium. Utah State University. Archived from the original on June 26, 2010. Retrieved November 29, 2010.
  3. The Xerces Society (2016), Gardening for Butterflies: How You Can Attract and Protect Beautiful, Beneficial Insects, Timber Press.
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