OregonFlora: Lathyrus japonicus vs. Lathyrus latifolius

	Lathyrus japonicus	Lathyrus latifolius
	beach pea, maritime pea	everlasting pea, perennial pea
Habit		Plants perennial.
Stems		sprawling or climbing, 8–20 dm, broadly winged, basally branched 1–many times.
Leaves		2–5 cm; leaflets 2, paired, lanceolate, 30–120 × 7–50 mm; > ½ as wide as stems; surfaces glabrous; tendrils well developed; stipules lanceolate; much < leaflets, bases semi-sagittate.
Inflorescences		5–15-flowered, 10–25 cm.
Flowers		15–20 mm; corollas purple; magenta, pink, or white.

	Lathyrus japonicus	Lathyrus latifolius
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Roadsides, disturbed areas. Flowering May–Aug. 0–1300 m. Casc, CR, Sisk, WV. CA, ID, NV, WA; widely scattered in Canada, throughout US; Europe. Exotic. Lathyrus latifolius is widely naturalized in North America and forms large thickets along roadsides, especially in the Pacific Coast states.
Source		Flora of Oregon, volume 2, page 690 Steven Broich
Sibling taxa	L. angulatus, L. aphaca, L. brownii, L. delnorticus, L. hirsutus, L. holochlorus, L. lanszwertii, L. latifolius, L. littoralis, L. nevadensis, L. nissolia, L. odoratus, L. palustris, L. pauciflorus, L. polyphyllus, L. rigidus, L. sativus, L. sphaericus, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. vernus, L. vestitus	L. angulatus, L. aphaca, L. brownii, L. delnorticus, L. hirsutus, L. holochlorus, L. japonicus, L. lanszwertii, L. littoralis, L. nevadensis, L. nissolia, L. odoratus, L. palustris, L. pauciflorus, L. polyphyllus, L. rigidus, L. sativus, L. sphaericus, L. sulphureus, L. sylvestris, L. tingitanus, L. torreyi, L. tracyi, L. vernus, L. vestitus
Subordinate taxa	L. japonicus var. glaber
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Lathyrus japonicus

Lathyrus latifolius

beach pea, maritime pea

everlasting pea, perennial pea

Habit

Plants perennial.

Stems

sprawling or climbing, 8–20 dm, broadly winged, basally branched 1–many times.

Leaves

2–5 cm;

leaflets 2, paired, lanceolate, 30–120 × 7–50 mm; > ½ as wide as stems;

surfaces glabrous;

tendrils well developed;

stipules lanceolate; much < leaflets, bases semi-sagittate.

Inflorescences

5–15-flowered, 10–25 cm.

Flowers

15–20 mm;

corollas purple; magenta, pink, or white.

Lathyrus japonicus

Lathyrus latifolius

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Roadsides, disturbed areas. Flowering May–Aug. 0–1300 m. Casc, CR, Sisk, WV. CA, ID, NV, WA; widely scattered in Canada, throughout US; Europe. Exotic.

Lathyrus latifolius is widely naturalized in North America and forms large thickets along roadsides, especially in the Pacific Coast states.

Source

Flora of Oregon, volume 2, page 690
Steven Broich

Sibling taxa