What do these ranks mean? ORBIC's ranking definitions

Greenman's Lomatium

Greenman's Lomatium

Lomatium greenmanii

List 1S1
Red-Fruited Lomatium

Red-Fruited Lomatium

Lomatium erythrocarpum

List 1S1S2

Ochoco Lomatium

Lomatium ochocense

List 1S2
Snake River Goldenweed

Snake River Goldenweed

Pyrrocoma radiata

List 1S3
Columbia Cress

Columbia Cress

Rorippa columbiae

List 1S3
Arrow-Leaf Thelypody

Arrow-Leaf Thelypody

Thelypodium eucosmum

List 1S2
Howell's Spectacular Thelypody

Howell's Spectacular Thelypody

Thelypodium howellii ssp. spectabilis

List 1S1
Spalding's Campion

Spalding's Campion

Silene spaldingii

List 1S2
South John Day Milk-Vetch

South John Day Milk-Vetch

Astragalus diaphanus var. diurnus

List 1S2
Peck's Milk-Vetch

Peck's Milk-Vetch

Astragalus peckii

List 1S3
Cusick's Lupine

Cusick's Lupine

Lupinus lepidus var. cusickii

List 1S1
Macfarlane's Four-O'clock

Macfarlane's Four-O'clock

Mirabilis macfarlanei

List 1S1
Whitebark Pine

Whitebark Pine

Pinus albicaulis

List 1S3?
Oregon Semaphore Grass

Oregon Semaphore Grass

Pleuropogon oregonus

List 1S1
Rough Pyrrocoma

Rough Pyrrocoma

Pyrrocoma scaberula

List 1S1
Verrucose Sea-Purslane

Verrucose Sea-Purslane

Sesuvium verrucosum

List 2S2
Bupleurum

Bupleurum

Bupleurum americanum

List 2S1

Bulb-Bearing Water-Hemlock

Cicuta bulbifera

List 2-exSH

Ibapah Wavewing

Cymopterus longipes var. ibapensis

List 2S2?
Snowline Cymopterus

Snowline Cymopterus

Cymopterus nivalis

List 2S2

Purple Cymopterus

Cymopterus purpurascens

List 2S2

Whorled Marsh Pennywort

Hydrocotyle verticillata

List 2S1
Bradshaw's Lomatium

Bradshaw's Lomatium

Lomatium bradshawii

List 1S2
Engelmann's Desert-Parsley

Engelmann's Desert-Parsley

Lomatium engelmannii

List 2S1
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