cream pea

(Lathyrus ochroleucus)

               
Conservation Status

IUCN Red List

not listed

cream pea

 

NatureServe

NNR - Unranked

SNR - Unranked

Minnesota

not listed

Nativity

Native

Occurrence

Common in Minnesota except in the southwest quarter of the state.

Habitat

Dry. Open, upland woodlands; woodland openings; thickets, bluffs; riverbanks, trailsides. Partial sun.

Flowering

May to July

 
Flower Color

White or yellowish-white

 
Height

Trailing or climbing: up to 32 long

 

Identification

Cream pea is a perennial forb that rises from a horizontal, underground, creeping stem (rhizome) and a fibrous root system.

The stems are slender, hairless, up to 32 long, and trail on the ground or climb over adjacent vegetation. They may be angled or round; green or purplish-brown; and covered with a whitish waxy bloom (glaucous)… or not. They are not winged.

The leaves are alternate and compound. They are on to 1¼ long leaf stalks (petioles) and are divided into 3 to 5 widely-spaced pairs of large leaflets. At the end of each leaf there is a slender tendril. At the base of each leaf there is a pair of small, leaf-like appendages (stipules). The stipules are to 1¼ long and asymmetrical. They are rounded at the base and sharply pointed at the tip, appearing half heart-shaped. They are often irregularly toothed. The shape of the stipules is distinctive, and can be used to identify the plant when no inflorescence is present.

The leaflets are opposite, thin, ellipse-shaped to lance egg-shaped, 1 to 2 long, and ½ to 1¼ wide. The upper surface is hairless and green. The lower surface is hairless and pale green. The margins are untoothed.

The inflorescence is an unbranched cluster (raceme) of 5 to 10 flowers rising on a long stalk (peduncle) from some of the leaf axils. The raceme and peduncle together are 2½ to 5 long, shorter than the subtending leaf.

The individual flowers are ½ to ¾ long and pea-like. They have 5 sepals, 5 petals, 10 stamens, and 1 style. The sepals are united into a long bell-shaped tube at the base then separated into 5 unequal lobes. The upper two lobes are short and triangular, the lowest one long and narrowly lance-shaped, the lateral two intermediate in both size and shape. The 5 petals are white or yellowish-white and are organized into a broad banner at the top, 2 wings, and a keel in the center formed by two petals fused together at the tip. The banner is egg-shaped to nearly circular and is strongly bent backward. The wings are broadly egg-shaped and are curved around and over the keel. The keel is boat-shaped, shorter than the wings, and curved upward. The stamens have ½ to 9 16 long filaments. Nine of the filaments are fused to above the base, the tenth is free nearly to the base. The flowers turn orange before wilting.

The fruit is a hairless, cylinder-shaped, flattened, 1½ to 2½ long, to ¼ in diameter seed pod.

 
Similar
Species

Veiny pea (Lathyrus venosus) stems are hairy. The stipules are narrower, 1 32 to wide, and are half arrow-shaped, with only one sharp basal lobe. The leaves have 4 to 7 pairs of leaflets. The racemes have 8 to 20 flowers. The corollas are pinkish-purple to lavender.


Distribution Distribution Map  

Sources: 2, 3, 4, 5, 7, 24, 28, 29, 30.


Comments

What’s in a Name?
The specific epithet (the second part of the scientific name) “ochroleucus” means yellowish-white, and accurately describes the color of the corolla.


Taxonomy

Family:

Fabaceae (pea)

 

Subfamily:

Faboideae (Papilionoideae)

 

Tribe:

Fabeae

 
Synonyms

 

 
Common
Names

cream pea

cream peavine

pale vetchling

white pea

yellow vetchling

   

 

 

 

 

 

 

 

Glossary

Filament

On plants: The thread-like stalk of a stamen which supports the anther. On Lepidoptera: One of a pair of long, thin, fleshy extensions extending from the thorax, and sometimes also from the abdomen, of a caterpillar.

 

Glaucous

Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.

 

Peduncle

In angiosperms, the stalk of a single flower or a flower cluster; in club mosses, the stalk of a strobilus or a group of strobili.

 

Raceme

An unbranched, elongated inflorescence with stalked flowers. The flowers mature from the bottom up.

 

Rhizome

A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.

 

Stipule

A small, leaf-like, scale-like, glandular, or rarely spiny appendage found at the base of a leaf stalk, usually occurring in pairs and usually dropping soon.

 

Wing

A thin, flat, membranous, usually transparent appendage on the margin of a structure.

       

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Luciearl


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Luciearl
6/20/2019

Location: Fairview Township, Cass County

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