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Panicum tenuifolium

Hook. & Arn. (1832)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Monocots Order: Poales Family: Poaceae Genus: Panicum

mountain pili

Description

Key Characters:

Growth Form: Cespitose perennials 25–120 cm tall.

Stems: Culms unbranched, papillose-pilose, the nodes glabrous to pilose.

Roots: Roots fibrous.

Leaves: Leaves simple. Alternate, primarily cauline. Blades 5-20 cm long, 0.1-0.5(-0.7) cm wide, usually loosely involute, sometimes mixed involute and flattened, or entirely flattened, papillose-pilose or rarely glabrous, especially on lower surface. Veins parallel. Sheaths papillose-pilose; ligule a ciliate membrane, 0.3-1.1 mm long, the membrane rudimentary, up to 0.2 mm long, the cilia 0.2-1.1 mm long. Stipules absent.

Flowers: Panicles 5-30 cm long, terminal, the branches ascending to widely spreading, usually solitary, scabrid to pilose, the axils puberulent or pilose; spikelets 2.1-3.6 mm long, acute to acuminate, glabrous; glumes as long as spikelet, equal or first glume slightly longer or shorter than second glume, first glume 5-7-nerved, acuminate to acute, second glume 7-nerved, acute. First floret sterile, first lemma as long as or slightly shorter than glumes, 5-7- nerved, first palea 1/3-1/2 as long as first lemma; second floret 1.7-1.8 mm long, 0.5-0.7 mm wide, 0.4-0.8 mm shorter than first lemma, elliptic to elliptic-lanceolate, glossy, smooth; anthers 1-1.2 mm long.

Fruit: Fruit a caryopsis

Ploidy:

Habitat: Occasional to common on talus slopes; lava flows; mountain parkland; or openings in dry forest.

Elevation Range: 1,200–2,300 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Endemic

Island Status

Kaua'i Endemic
O'ahu Endemic
Molokai Endemic
Lana'i Endemic
Maui Endemic
Hawai'i Endemic

Dispersal Agents


Pollinators

Bibliography

Name Published In: Bot. Beechey Voy.: 100 (1832)

Other References

Wagner et al. 1990:1573 (O, Mo, L, M, H); Herbst & Clayton 1998:31 (K); Faccenda 2023c:127 (remove K [re-IDed as P. nephelophilum]); Lay s.n. BISH 455221 (O†, 1826); Munro 269 BISH (L†, 1914)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Panicum tenuifolium Hawaii Volcanoes National Park, top of Maunaloa Strip Road. Growing in subalpine zone. Preserved_Specimen Caespitose upright grass. Hobdy, R.W. 4336 Hawaii BISH 2011-06-20
2 Panicum tenuifolium Above Kaupo Ranch, ridge up to Kaupo Gap Mesic forest. Preserved_Specimen Wagner, W.L. 5683 Maui BISH 1986-07-14
3 Panicum tenuifolium Kahikinui, NW of Manukani, near forest boundary Open rocky ground. Preserved_Specimen Hobdy, R.W. 1166 Maui BISH 1981-11-06
4 Panicum tenuifolium Kamokou Preserve, ridge between Kupai`a and Kaunakakai Gulches, East Moloka`i. Dry shrubland of native shrubs and both native and alien grasses. Preserved_Specimen Bunchgrass with green infloresences. Pratt, L.W. 1241 Molokai BISH 1982-05-30
5 Panicum tenuifolium Kahikinui, NW of Manukani, near forest boundary Open rocky ground. Preserved_Specimen Hobdy, R.W. 1166 Maui BISH 1981-11-06
6 Panicum tenuifolium Bird park, Hawaii National Park. Kilauea, Kau Open slope Preserved_Specimen Occasional Hosaka, E.Y. 1429 Hawaii BISH 1936-07-06
7 Panicum tenuifolium Above Kaupo Ranch, ridge up to Kaupo Gap Mesic forest. Preserved_Specimen Wagner, W.L. 5682 Maui BISH 1986-07-14
8 Panicum tenuifolium Humuula, at base of Puu Huluhulu On lava flow. Preserved_Specimen Neal, M.C. 673 Hawaii BISH 1935-08-06
9 Panicum tenuifolium W Maui, Hanaula, Mana Wainui Plant Sanctuary Near bottom of gulch slope in open mesic forest. Preserved_Specimen Hobdy, R.W. 2065 Maui BISH 1984-04-20
10 Panicum tenuifolium W Maui, Hanaula iki, upper Papalaua valley With Metrosideros - Diospyros sandwicensis, Pleomele auwahiensis, Nestegis sandwicensis, Myrsine lanaiensis, Leptecophylla, Acacia koa, Dodonaea viscosa, Carex meyenii, Chamaesyce multiformis, Sida fallax, Wikstroemia oahuensis, Lantana camara, Erigeron karvinskianus, Melinis minutiflora, Ageratina adenophora, Opuntia. Preserved_Specimen Grass with fls and frt. Perlman, S. 20456 Maui BISH 2007-06-25
11 Panicum tenuifolium Hawaii Volcanoes National Park, 2nd bridged gully west of Pohakuloa State Park, south side of Saddle Road. gully, growing w/Emex. Preserved_Specimen Herbst, D.R. 1476 Hawaii BISH 1970-01-04
12 Panicum tenuifolium S of Kaulahuki On arid, barren slope Preserved_Specimen In tufts Degener, O. 10865 Molokai BISH 1928-04-11
13 Panicum tenuifolium Kukaiau Ranch Corner of pasture. Preserved_Specimen Clumps, plant 1/4 m tall. Lee, H.A. 167 Hawaii BISH 1926-03-01
14 Panicum tenuifolium Greenwell Ranch, Kealakekua On basalt on shaded talus in entrance to lava tube. Preserved_Specimen St.John, H. 23978 Hawaii BISH 1949-12-31
15 Panicum tenuifolium Bird Park (Kipuka Puaulu) Moderate forest. Preserved_Specimen Morley, H. 154 Hawaii BISH 1934-08-21
16 Panicum tenuifolium On Mauna Loa Strip Rd about 10.3 mi toward summit from intersection with Kona-Hilo Hwy; plant was on E side of the road (plot 24) Montane Acacia-Deschampsia community (mountain parkland formation); plant was in an Acacia colony. Preserved_Specimen Newell, C.L. 13 Hawaii BISH 1966-07-06
17 Panicum tenuifolium W Maui, Lahaina District, Olowalu, leeward foothills of Lihau Growing in dry shrubland on rocky slope. Preserved_Specimen Oppenheimer, H.L. 129701 Maui BISH 1997-12-14
18 Panicum tenuifolium Makakupaia edge of forest Preserved_Specimen rare Hosaka, E.Y. 3623 Molokai BISH 1950-12-23
19 Panicum tenuifolium South Kohala, Waikoloa, Waikii Occasional in pasture. Preserved_Specimen Hosaka, E.Y. 2283 Hawaii BISH 1938-06-10
20 Panicum tenuifolium Hamakua, Waikii-Humuula Rd.-Kaohe 4 Sandy plains. Preserved_Specimen Ewart III, G.R. 165 Hawaii BISH 1932-05-02
21 Panicum tenuifolium Haleakala National Park, Kaupo Trail Grows in shade on moderately wet old lava flows. Preserved_Specimen Olson, G.E. 64 Maui BISH 1937-07-20
22 Panicum tenuifolium Papaloa, Kona Preserved_Specimen Forbes, C.N. 313 Hawaii BISH 1911-07-14
23 Panicum tenuifolium Mauna Loa, beside rain shelter at end of Mauna Loa Strip Rd Associated with koa, Metrosideros, Sophora, introduced grasses as Sporobolus, Bromus. Preserved_Specimen Herbst, D.R. 261 Hawaii BISH 1966-08-14
24 Panicum tenuifolium Kona, mauka of Papaloa, HQ of Kealakekua Ranch With scrubby ohia and mamane. Preserved_Specimen Christ, J.H. Hawaii BISH 1958-11-23
25 Panicum tenuifolium Haleakala Crater, N side of Sliding Sands Trail. Preserved_Specimen Single individual. Welton, P. 2308 Maui BISH 2011-05-16
26 Panicum tenuifolium Puu Kekee Flats Preserved_Specimen Goff, R.A. 37 Hawaii BISH 1928-07-13
27 Panicum tenuifolium Pauahi, Kealakekua, S. Kona Occurs in koa pasture, moist place, Preserved_Specimen Forming tufts Hosaka, E.Y. 1486 Hawaii BISH 1936-08-13
28 Panicum tenuifolium Kaunakakai Gulch, on S slope. Below forestry pine plantings on Makakupaia ridge Steep slope. Scatterd plants growing beneath Dodonaea stenoptera, Scaevola gaudichaudii, and Styphelia shrubs. Also present: Alyxia, Dianella, Luzula, Hypochoeris, Eupatorium, Elaphoglossum, Microlepia, and Sphenomeris. Preserved_Specimen Davis, J. 818 Molokai BISH 1982-05-26
29 Panicum tenuifolium On slope of Kaikipauula, Upper Paauhau, Waimea, Hamakua Preserved_Specimen Rare, forming tufts, 1-2 ft. tall. Hosaka, E.Y. 2195 Hawaii BISH 1938-06-03
30 Panicum tenuifolium Kaupo Trail Preserved_Specimen Conspicuously pale green; rather local; loosely tufted. (Not on sheet) 47 Maui BISH 1939-08-15
31 Panicum tenuifolium Mauna Loa slope Preserved_Specimen Baldwin, P.H. 22 Hawaii BISH 1941-07-02
32 Panicum tenuifolium Along Saddle Road, Pohakuloa Training Area, between 30 and 45 mile markers, within 60 feet of the road. Preserved_Specimen Funk, E.J. 53 Hawaii BISH 1990-12-13
33 Panicum tenuifolium Waiakeakua Preserved_Specimen Munro, G.C. 269 Lanai BISH 1914-04-15
34 Panicum tenuifolium On Mauna Loa Strip Rd about 10.3 mi toward summit from intersection with Kona-Hilo Hwy; plant was on E side of the road (plot 24) Montane Acacia-Deschampsia community (mountain parkland formation); plant was in an Acacia colony. Preserved_Specimen Newell, C.L. 12 Hawaii BISH 1966-07-06
35 Panicum tenuifolium W Maui, Manawainui Plant Sanctuary, Lower Hanaula Growing on steep lower gulch slope in partial shade. Preserved_Specimen Hobdy, R.W. 1061 Maui BISH 1981-04-16
36 Panicum tenuifolium Papaloa, Kona Preserved_Specimen Forbes, C.N. 315 Hawaii BISH 1911-07-15
37 Panicum tenuifolium West Maui, Lahaina, S of Ukumehame Valley gulch of Hanaula Iki E facing gulch slopes. Associated vegetation: Metrosideros, Diospyros, Pouteria, Dodonaea, Wikstroemia, Osteomeles, Leptecophylla, Coprosma, Bidens, Carex, Dianella, Santalum, Eragrostis, Doodia, Pteridium, Peperomia, Dryopteris, Doryopteris. Preserved_Specimen Oppenheimer, H.L. 60724 Maui BISH 2007-06-25
38 Panicum tenuifolium Mauna Loa truck trail Fenced koa area. Preserved_Specimen Fagerlund, G.O. 576 Hawaii BISH 1943-05-24
39 Panicum tenuifolium Kukaiau Ranch Dry soil in gulch, open woods. Preserved_Specimen Hitchcock, A.S. 14208 Hawaii BISH 1916-08-18
40 Panicum tenuifolium Slope of Mauna Kea, west of Waimea Preserved_Specimen Whitney, L.D. 4146 Hawaii BISH 1936-04-06
41 Panicum tenuifolium Kona, Papaloa Preserved_Specimen Forbes, C.N. 313 Hawaii BISH 1911-06-14
42 Panicum tenuifolium Mauna Loa slope, Hawaii National Park Preserved_Specimen Baldwin, P.H. 27 Hawaii BISH 1941-07-02
43 Panicum tenuifolium Hawaii Preserved_Specimen (Not on sheet) 4146 Hawaii BISH
44 Panicum tenuifolium East Maui, Haleakala Crater; Sliding Sands Trail Preserved_Specimen Welton, P. 2308 Maui BISH 2011-05-15
45 Panicum tenuifolium Near end of Mauna Loa truck road from Kilauea Preserved_Specimen Cranwell, L.M. 3277 Hawaii BISH 1938-09-14
46 Panicum tenuifolium Waiakeakua Preserved_Specimen Munro, G.C. 334 Lanai BISH 1914-04-15
47 Panicum tenuifolium Kanehaha, Kona Preserved_Specimen Forbes, C.N. 259 Hawaii BISH 1911-06-25
48 Panicum tenuifolium Near end of Mauna Loa truck road from Kilauea Preserved_Specimen Cranwell, L.M. 3277 Hawaii BISH 1938-09-14
49 Panicum tenuifolium East Maui, Nuu, Waiopaa (Waiopai?) Ranch Preserved_Specimen Forbes, C.N. 1873 Maui BISH 1920-03-06
50 Panicum tenuifolium East Maui, Holua Cave, Talus slope N Preserved_Specimen (Not on sheet) Maui BISH 1939-08-19
51 Panicum tenuifolium [Hawaiian Islands; U.S.A.; O`ahu; Hawai`i; Honolulu] Preserved_Specimen Lay, G.T. Oahu BISH 1826-01-01
52 Panicum tenuifolium Slope above Humuula Preserved_Specimen Bryan Jr., E.H. Hawaii BISH 1935-07-30
53 Panicum tenuifolium Hawaii Preserved_Specimen Rémy, J. 95 Hawaii BISH 1851-01-01
54 Panicum tenuifolium Mauna Loa, E slopes at road from Kilauea Preserved_Specimen Krajina, V.J. 611226055 Hawaii BISH 1961-12-26
55 Panicum tenuifolium S Kohala, Waikii In dry open pasture. Preserved_Specimen Common. Hosaka, E.Y. 1576 Hawaii BISH 1936-09-07
56 Panicum tenuifolium Kiilae, S. Kona Koa forest, dry place on aa Preserved_Specimen Forming tufts, Occasional Hosaka, E.Y. 1513 Hawaii BISH 1936-08-21
57 Panicum tenuifolium E of Humuula, below Kalaieha On pahoehoe. Preserved_Specimen Neal, M.C. 689 Hawaii BISH 1935-08-07
58 Panicum tenuifolium Kamakou Preserve, Kawela Section, Upper Onini Gulch On S side of gulch in native scrub of pukiawe, `a`ali`i, `akia, `ilima and mamane. Preserved_Specimen Weakly erect bunch grass 1.5 ft. tall; some spikelets purple or purple-tipped. Cuddihy, L.W. 1221 Molokai BISH 1982-05-28
59 Panicum tenuifolium East Maui, Onini Gulch above Kawela crossover road. Growing in shade of native forest on the steep banks. Preserved_Specimen Hobdy, R.W. Maui BISH 1977-07-15
60 Panicum tenuifolium Greenwell Ranch, Kealakekua On basalt on shaded talus in entrance to lava tube. Preserved_Specimen St.John, H. 23978 Hawaii BISH 1949-12-31
61 Panicum tenuifolium Hawaii Nat. Park, Kipuka Ki In cracks in `a`a lava. Preserved_Specimen Uncommon. Webster, G.L. 1712 Hawaii BISH 1948-06-16
62 Panicum tenuifolium Koolau Gap, Haleakala Crater Rocky region fogswept at night. Preserved_Specimen Degener, O. 10724 Maui BISH 1927-08-19
63 Panicum tenuifolium Puehuehunui, S of Kauaula rim upper rim of small drainage, mixed mesic forest; Metrosideros polymorpha, Cheirodendron trigynum, Dodonaea viscosa, Nestegis sandwicensis, Hedyotis acuminata, Cyrtandra grayi, Melicope hawaiiense Preserved_Specimen delicate grass; rhizome creeping; flower Wood, K.R. 11934 Maui BISH 2006-06-21
64 Panicum tenuifolium Kukaiau Ranch Dry soil in gulch, open woods. Preserved_Specimen Hitchcock, A.S. 14208 Hawaii BISH 1916-08-18
65 Panicum tenuifolium W slope of Mauna Kea, Puu Laau Dry grass land. Preserved_Specimen Ewart III, G.R. 209 Hawaii BISH 1932-05-29
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