Blackboard Tree vs Common Salsify

Alstonia scholaris compared with Tragopogon porrifolius

Key Differences

• Blackboard Tree is Least Concern while Common Salsify is Not Evaluated.

Taxonomic Classification

Rank	Blackboard Tree	Common Salsify
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Gentianales (Gentianales)	Asterales (Daisies & Sunflowers)
Family	Apocynaceae	Asteraceae (Daisy Family)
Genus	Alstonia	Tragopogon
Species	Alstonia scholaris	Tragopogon porrifolius

Evolutionary Relationship

Blackboard Tree and Common Salsify share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Blackboard Tree

LC — Least Concern

Common Salsify

NE — Not Evaluated

Physical Characteristics

Attribute	Blackboard Tree	Common Salsify
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blackboard Tree

Habitat

Inhabits tropical and subtropical moist broadleaf forests and tropical and subtropical dry broadleaf forests within the Oceanian biogeographic realm.

Range

Distributed across Micronesia, Taiwan, and United States.

Common Salsify

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Widely distributed across Asia (India, Japan, Taiwan), Europe (16 countries), North America (Canada, Mexico, United States), Oceania and the Pacific (Australia), and South America (Argentina, Chile).

Blackboard Tree

The Blackboard Tree (Alstonia scholaris) is a species in the genus Alstonia. It is currently classified as Least Concern on the IUCN Red List. Inhabits tropical and subtropical moist broadleaf forests and tropical and subtropical dry broadleaf forests within the Oceanian biogeographic realm.

Common Salsify

<em>Tragopogon porrifolius</em>, commonly known as common salsify, vegetable oyster, or purple salsify, is a biennial or perennial herbaceous plant in the family Asteraceae. Native to Mediterranean Europe and western Asia, it has been widely cultivated as a root vegetable since antiquity and has naturalized extensively across Europe, the Americas, Australia, and parts of Asia. The plant typically grows on roadsides, waste ground, dry grasslands, and disturbed soils in sunny locations. In its first year it produces a rosette of grass-like, grey-green leaves; in the second year it produces tall, branched stems bearing showy purple flower heads that resemble large dandelions, typically 5–7 centimeters in diameter. The edible taproot has a pale, somewhat oyster-like flavor when cooked, and the young shoots and flower buds are also edible. Common salsify is not currently evaluated on the IUCN Red List. Pollination is primarily by bees and other insects visiting the flowers, which open only in morning sunlight. Seeds are dispersed by wind via a feathery pappus. The species favors well-drained, moderately fertile soils and can be found in both rural and urban habitats. Biological traits such as average lifespan, body measurements, and detailed ecological diet data remain poorly documented in standardized ecological databases.

Shared Countries

Both species can be found in 2 countries:

🇹🇼 Taiwan 🇺🇸 United States