Harold St. John

Lysichiton americanus, also called western skunk cabbage (US), yellow skunk cabbage (UK), American skunk-cabbage (Britain and Ireland) or swamp lantern, is a plant found in swamps and wet woods, along streams and in other wet areas of the Pacific Northwest, where it is one of the few native species in the arum family. The plant is called skunk cabbage because of the distinctive "skunky" odor that it emits when it blooms. This odor will permeate the area where the plant grows, and can be detected even in old, dried specimens. The distinctive odor attracts its pollinators, scavenging flies and

Elodea nuttallii is a species of waterweed known by the common name western waterweed or Nuttall's waterweed. This is a perennial aquatic plant which is native to North America where it grows submersed in lakes, rivers, and other shallow water bodies. It is also found in Eurasia, where it is commonly weedy; it is not known as a weed species in its native range. It is sometimes used as an aquarium plant.

Gardenia mannii, the nānū, Oahu gardenia or Mann's gardenia, is a species of flowering tree in the family Rubiaceae, that is endemic to the island of Oʻahu in Hawaiʻi. It inhabits coastal mesic, mixed mesic, and wet forests at elevations of 100–730 m (330–2,400 ft) in the Koʻolau and Waiʻanae Ranges. It is threatened by habitat loss. There are 18 populations remaining with a total of no more than 110 individuals.

Xylosma crenata, the sawtooth logwood, is a species of flowering plant in the family Salicaceae. It is endemic to the island of Kauaʻi in Hawaii. It is a tree, reaching a height of 46 ft (14 m). Sawtooth logwood inhabits montane mesic forests dominated by koa (Acacia koa) and ʻōhiʻa lehua (Metrosideros polymorpha) at an elevations of 975–1,065 m (3,199–3,494 ft). It is threatened by habitat loss.

Pritchardia napaliensis is a species of palm tree that is endemic to the island of Kauaʻi in Hawaii, United States. It inhabits gulch slopes in coastal mesic forests on the Nā Pali coastline, especially in the vicinity of Hoʻoluu Valley. P. napaliensis reaches a height of 4–6 m (13–20 ft) and a trunk diameter of 18–20 cm (7.1–7.9 in).

Pandanus aldabraensis is a species of plant in the family Pandanaceae. It is endemic to Aldabra in the Seychelles. It is threatened by habitat loss.

Brighamia rockii, known as the Molokai ohaha or Pua ʻala in Hawaiian, is a species of flowering plant in the bellflower family, Campanulaceae, that is endemic to the island of Molokaʻi in Hawaii. Pua ʻala inhabits mesic shrublands and forests on rocky cliffs from sea level to 470 m (1,540 ft) on the island's northern windward coast. Associated plants include ʻōhiʻa lehua (Metrosideros polymorpha), alaheʻe (Psydrax odorata), lama (Diospyros sandwicensis), ʻūlei (Osteomeles anthyllidifolia), and naupaka (Scaevola gaudichaudii). Pua ʻala reaches a height of 1–5 m (3.3–16.4 ft) and has a

Panicum niihauense is a rare species of grass known by the common names lau ʻehu and Niʻihau panicgrass. It is endemic to Hawaii, where it has been found on the islands of Niʻihau and Kauaʻi. It has not been observed on Niʻihau since 1949, and there are fewer than 40 individuals remaining on Kauaʻi, not counting a few individuals that have been deliberately planted in appropriate habitat. The grass is a federally listed endangered species of the United States. The only naturally occurring specimens of the grass grow in Polihale State Park. There they grow on sand dunes and they are threatened

Glochidion pitcairnense is a species of plant in the family Phyllanthaceae. It occurs only on Henderson Island and Pitcairn Island in the southern Pacific Ocean, with respective populations of approximately 20,000 and 500.

Calandrinia galapagosa is a species of plant in the Montiaceae family. It is endemic to the Galápagos Islands of Ecuador.

Allium dictuon is a species of wild onion known by the common name Blue Mountain onion. It is native to a small section of the Blue Mountains straddling the border between southeastern Washington and northeastern Oregon in the United States. It grows in Columbia, Garfield and Walla Walla Counties in Washington, plus Umatilla and Wallowa Counties in Oregon.

Pandanus lacuum is a species of plant in the family Pandanaceae. It is endemic to New Caledonia.

Lobelia niihauensis, commonly known as the Niihau lobelia, is a rare species of flowering plant in the bellflower family that is endemic to Hawaii. It is known only from the islands of Oʻahu and Kauaʻi and is thought to be extirpated from Niʻihau. It is federally listed as an endangered species of the United States. This plant grows only on exposed dry to mesic steep cliffs from 125 to 725 m. Predation, probably by goats, may have eliminated it from any other type of habitat. It produces long terminal inflorescences of magenta flowers.

Homalium taypau is a species of plant in the family Salicaceae. It is endemic to Pitcairn. It is threatened by habitat loss.

Geranium kauaiense is a rare species of geranium known by the common name Kauai geranium. It is endemic to Hawaii, where it is known only from the island of Kauai. It was federally listed as an endangered species in 2010. Like other Hawaiian geraniums, this plant is known as hinahina and nohoanu. This plant is a subshrub with stems up to a meter long. The inflorescence is a cyme of 3 or 4 flowers with purple-striped white petals. This plant grows in the wet forests and bogs of Alakai Wilderness Preserve on Kauai, where there are about 140 plants remaining. There are also three plants at the

Elodea bifoliata, commonly called twoleaf waterweed, is a species of perennial flowering plant in the waterweed genus, Elodea. It grows in much of the western United States and Canada. It was only recognized as a separate species in the 1960s. It is found growing in streams and shallow bodies of water.

Cyrtandra waianaeensis, the Waiʻanae cyrtandra, is a species of flowering plant in the family Gesneriaceae, native to Oahu, Hawaii. A shrubby tree reaching 20 ft (6 m), it is recommended as an accent or specimen plant due to its textured greenish-yellow to green foliage. Its habitats include disturbed mesic valleys, diverse mesic forests, and wet forests.

Cyrtandra kaulantha, the Waikane valley cyrtandra, is a species of flowering plant in the family Gesneriaceae, native to Oahu, Hawaii. It is of hybrid origin, with the parents possibly being C. grandiflora and C. hawaiensis.

Canavalia napaliensis, commonly known as the Mākaha Valley Jack-bean, is a species of flowering plant in the pea family, Fabaceae, that is endemic to Hawaii. It was previously more widespread in the archipelago and could be found in Oʻahu's Mākaha Valley, but is today restricted to northwestern Kauaʻi. This and other Hawaiian Canavalia are known there as ʻāwikiwiki. Its natural habitats are tropical dry forests, lowland moist forests, dry shrublands, and moist shrublands. It is threatened by habitat destruction, mainly due to introduced grazing mammals. There are no more than 206 individual

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Achyranthes atollensis (also called atoll achyranthes or Hawaiʻi chaff flower) was a species of plant in the family Amaranthaceae. It was endemic to the Northwestern Hawaiian Islands of Kure, Midway, Laysan and the Pearl and Hermes Atoll. Its natural habitat was sandy shores. It became extinct due to habitat loss (residential, commercial and military installation development) and the introduction of non-native species, and was last seen in 1964. It was a perennial shrub living in dry shrublands on calcareous sand and atolls.

Sticherus flabellatus, the shiny fan fern, or umbrella fern, is a small fern found in eastern Australia and in New Zealand, northwards from the north-west of the South Island. It is a common and attractive plant with shiny dark foliage and with slightly toothed edges on the smallest parts of the fronds, often seen in large numbers in suitably moist gullies and by creeks. Two varieties are recognized that differ in size of the sporangia and the size of the ultimate segments. The variety in New South Wales is Sticherus flabellatus var. flabellatus. In 1810 it appeared as Gleichenia flabellata

Sophora rapaensis is a species of flowering plant in the family Fabaceae. It is a tree endemic to the island of Rapa Iti in the Tubuai Islands of French Polynesia.

Sophora raivavaeensis is a species of flowering plant in the family Fabaceae. It is a tree endemic to Raivavae in the Tubuai Islands of French Polynesia. It grows in humid shrubland, on cliffs and rock outcrops. The population is estimated at fewer than 250 mature individuals, and the IUCN Red List assesses the species as Critically Endangered. The species was first described by Harold St. John in 1985.

Sophora mangarevaensis is a species of flowering plant in the family Fabaceae. It is a tree endemic to the island of Mangareva in the Tuamotu Archipelago of French Polynesia. It grows on cliffs and on rock outcrops. It is threatened by predation by goats, competition from invasive plants, and fires. There are estimated to be fewer than 250 individuals, and the IUCN Red List assesses the species as Critically Endangered.

Schiedea adamantis, commonly known as Diamond Head schiedea, is a species of flowering plant in the family Caryophyllaceae, that is endemic to the island of Oʻahu in Hawaii. It inhabits low shrublands on steep slopes along the northwest rim of Diamond Head Crater. Associated plants include nehe (Lipochaeta lobata var. lobata), kāwelu (Eragrostis variabilis), ʻakoko (Euphorbia degeneri), and ʻilima (Sida fallax). There are only about 30 individuals remaining, and they are threatened by habitat loss. Schiedea adamantis is a rare Hawaiian plant that is endangered due to climate change and

Phyllostegia kaalaensis, the Kaala phyllostegia, is a species of flowering plant in the mint family, Lamiaceae, that is endemic to the island of Oʻahu in Hawaiʻi. It can be found in mesic forests on the slopes of the Waiʻanae Range at elevations of 374–796 metres (1,227–2,612 ft). In 2003 there were 36 or 37 individuals remaining. By 2008 all wild individuals were thought to have been extirpated. Some plants are in propagation and have been planted in appropriate habitat.

Pandanus conicus, commonly known as screw palm, is a species of plants in the family Pandanaceae found only in Queensland, Australia. It is a slim tree up to 10 m (33 ft) tall with spreading branches, and the trunk bears numerous small spiny "warts". The leaves may be up to 2 m (6 ft 7 in) long and 3.5 cm (1.4 in) wide, with sharp spines on the margins. They are arranged in densely clustered whorls at the ends of the branches. The plant inhabits rainforest and vine thickets on the east coast of the northern half of Cape York Peninsula, south to about Coen. This species is dioecious, meaning

Ochrosia kilaueaensis is an extinct species of flowering plant in the genus Ochrosia in Apocynaceae. Its common names include holei and Hawaii yellowwood. It was endemic to the island of Hawaiʻi. It has been collected only at Puuwaawaa and Kipuka Puaulu and has not been seen since the 1940s.

Ochrosia kauaiensis, the Kauaʻi yellowwood, is a species of plant in the family Apocynaceae. It is endemic to the island of Kauaʻi in Hawaii. It is threatened by habitat loss.