OregonFlora: Lathyrus japonicus vs. Lathyrus tracyi

	Lathyrus japonicus	Lathyrus tracyi
	beach pea, maritime pea	Tracy's pea
Habit		Plants perennial.
Stems		erect, sprawling or climbing, 2–6 dm, ribbed or angled, often branched at mid-stem 1–4 times.
Leaves		2–6 cm; leaflets 4–8, usually paired; ovate to linear, 15–30 × 5–20 mm or 30–70 × 1–10 mm; surfaces glabrous or pubescent; tendrils well developed or not; tendrils well developed or not; stipules linear; < leaflets, bases semi-sagittate.
Inflorescences		5–15-flowered, 2–7 cm.
Flowers		7–13 mm; corollas white; wings ? keels.

	Lathyrus japonicus	Lathyrus tracyi
Distribution	[WildflowerSearch map] [BONAP county map]
Discussion		Roadsides, open coniferous and mixed evergreen forests. Flowering May–Jul. 1400–1800 m. Sisk. CA. Native. Lathyrus tracyi includes both ovate- and linear-leafleted forms. Linear-leafleted populations certainly suggest a relationship to L. lanszwertii, but ovate-leafleted forms, the presence of mid-stem branching, and floral structure suggest that L. tracyi may be better allied to L. holochlorus found to the north in the Willamette Valley.
Source		Flora of Oregon, volume 2, page 694 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. 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. vernus, L. vestitus
Subordinate taxa	L. japonicus var. glaber
Synonyms		Lathyrus lanszwertii var. tracyi
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: CA, OR Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Lathyrus tracyi

beach pea, maritime pea

Tracy's pea

Habit

Plants perennial.

Stems

erect, sprawling or climbing, 2–6 dm, ribbed or angled, often branched at mid-stem 1–4 times.

Leaves

2–6 cm;

leaflets 4–8, usually paired; ovate to linear, 15–30 × 5–20 mm or 30–70 × 1–10 mm;

surfaces glabrous or pubescent;

tendrils well developed or not;

stipules linear; < leaflets, bases semi-sagittate.

Inflorescences

5–15-flowered, 2–7 cm.

Flowers

7–13 mm;

corollas white;

wings ? keels.

Lathyrus tracyi

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Roadsides, open coniferous and mixed evergreen forests. Flowering May–Jul. 1400–1800 m. Sisk. CA. Native.

Lathyrus tracyi includes both ovate- and linear-leafleted forms. Linear-leafleted populations certainly suggest a relationship to L. lanszwertii, but ovate-leafleted forms, the presence of mid-stem branching, and floral structure suggest that L. tracyi may be better allied to L. holochlorus found to the north in the Willamette Valley.

Source

Flora of Oregon, volume 2, page 694
Steven Broich

Sibling taxa