Alliaceae: Onion Family

Sierra Onion – Allium campanulatum

Blooms:

Mar–Oct

Plant Height:

16–30 cm

Flower Size:

Small

Origin:

Native

Habitat:

Dry mountain slopes above 600 m

Notes:

A comparatively small plant, with leaves that are usually withered by the time of flowering. Striking rose to purple flowers with a darker purple crescent at the base of each petal.

Crinkled Onion – Allium crispum

Blooms:

Mar–May

Plant Height:

15–35 cm

Flower Size:

Medium

Origin:

Native

 Habitat:

Heavy soil on inland hills

Notes:

Distinguished by the toothed, curled (“crisped”) margins of the inner petals. The deep rose-purple flowers are in open umbels. 2 or 3 leaves, shorter than the stem.

Hickman’s Onion – Allium hickmanii

Blooms:

Mar–May

Plant Height:

5–17 cm

Flower Size:

Medium

Origin:

Native

Rare or endangered

Rare – 1b.2

 Habitat:

Moist grassland near coast

Notes:

Generally much smaller than its reported maximum height of 17 cm and challenging to spot in long grass,  Petals are white to pink, more or less equal in size. 1 or 2 narrow leaves, often longer than the stem.

Three-cornered Onion – Allium triquetrum

Blooms:

Mar–Apr

Plant Height:

10–40 cm

Flower Size:

Small

Origin:

Europe

Habitat:

Woodland, moist places

Notes:

Very common garden escape.  Distinguished by its pure white flowers with a dark green stripe in the center of each petal and sharply triangular stem.

One-leaved Onion – Allium unifolium

Blooms:

May–June

Plant Height:

10–80 cm

Flower Size:

Medium

Origin:

Native

Habitat:

Moist places

Notes:

Despite its name, this onion has 2–3 leaves, which are shorter than the stem. The inflorescence has 14–35 flowers, with pink or white petals.  The flowers are 11–15 mm long, with 6 ovary crests in 3 pairs, separated by a longitudinal ridge.