Ericaceae-Arctostaphylos2017-05-23T14:54:42+00:00

Ericaceae: Heath Family — Arctostaphylos (Manzanita)

Manzanitas can be extremely challenging to identify with certainty. All have similar flowers and a range of features that frequently overlap more than  one species. They are notorious for their proclivity for hybridization, and many examples will be found that will challenge the expert, let alone the layman.

The first thing to look for (though not always easy to see) is whether the shrub has a burl at the base of the main stem. About 30% of all manzanitas have burls, a repository of dormant buds which allows the plant to resprout from the base if the above-ground part of the shrub is destroyed in a wildfire.

Next, one has to consider the leaves; how they are growing, are they mainly erect or are they spreading, are they similar in appearance above and below and are they tomentose (densely white-hairy), glabrous, or something in between? Are they glandular? The shape of the leaves, particularly the tips and the bases, can often help differentiate between species.

The degree of hairiness and the presence or not of glands are other features to consider as is the  bark. Several species have shaggy bark but with subtle differences in their appearance.

Crinite Manzanita – Arctostaphylos crustacea subsp. crinita

Blooms:

Feb–Apr

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Chaparral & conifer forest

Notes:

This is similar to Brittle-leaf Manzanita (subsp. crustacea) but with leaves that are densely non-glandular hairy below and occasionally above. Both twigs and nascent inflorescences have both short and long stiff, non-glandular hairs.

Brittle-leaf Manzanita – Arctostaphylos crustacea subspcrustacea

Blooms:

Feb–Apr

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Chaparral & conifer forest

Notes:

Both this and Crinite Manzanita (subsp. crinita) have a prominent burl, spreading leaves 2–5 cm long on short (2–5 mm) petioles.  Stems are reddish and bark may be peeling.  This subspecies has leaves that are dark green and glabrous above and light green and non-glandular hairy below.  Flowers are hairy but not glandular. The third photo shows the flowers being pollinated by a bee using the “buzz pollination” technique.

Eastwood’s Manzanita – Arctostaphylos glandulosa subspglandulosa

Blooms:

Jan–Apr

Plant Height:

1–4 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Widespread in Santa Lucia Mountains

Notes:

Like Arctostaphylos crustacea, this has a burl, hemispheric but not necessarily prominent (subsp. crinita).  Leaves are spreading but on longer petioles (5–10 mm). Stems are short hairy, glandular or not. Leaves are variable, sometimes glandular and slightly hairy, rough to the touch, sometimes smooth. Flowers are glandular.

Big-berried Manzanita – Arctostaphylos glauca

Blooms:

Dec–Mar

Plant Height:

1–8 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Chaparral, rocky slopes, woodland

Notes:

This manzanita does not have a burl. It is most easily distinguished by its glaucous, blue-gray leaves, ovate to roundish in shape and with a rounded base. The third photo shows a large specimen with a green-leaved manzanita in front of it, highlighting the difference in color quite clearly. The fruits are spherical and large (10–15 mm). It can grow into a good-sized tree. It is very common in the Pinnacles, one of the two species of manzanitas found there.

Hooker’s Manzanita – Arctostaphylos hookeri subsp. hookeri

Blooms:

Feb–Apr

Plant Height:

0.5–1.5 m

Flower Size:

Medium cluster

Origin:

Native

Rare or Endangered?

Yes – 1.b2

Habitat:

Chaparral & sandy places and woods near coast

Notes:

One of the more easily recognized manzanitas with its small (2– 3 cm) bright green leaves which are totally hairless, shiny, lanceolate to elliptic with acute tips.  The plant is fairly small and often forms a neat, low mound.  It has no burl.

Toro Manzanita – Arctostaphylos montereyensis

Blooms:

Jan–Mar

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Rare or Endangered?

Yes – 1.b2

Habitat:

Ancient sand dunes

Notes:

Endemic to Monterey County where it is found in coastal chaparral. This species does not have burls. It has shredding bark, the old stems smooth and red. Leaves are erect, round to oblong-ovate and not overlapping.  Leaf surfaces are bright green or more or less glaucous.  The leaf base is rounded to truncate and the tip is abruptly soft-pointed.  Flower bracts are often red-tinged.

Pajaro Manzanita – Arctostaphylos pajaroensis

Blooms:

Dec–Feb

Plant Height:

1–4 m

Flower Size:

Medium cluster

Origin:

Native

Rare or Endangered?

Yes – 1.b1

Habitat:

Chaparral, sandstone outcrops

Notes:

The only manzanita with both shredding bark and bifacial leaves (i.e. with differing upper and lower surfaces). It does not have burls. Leaves are overlapping, ovate to triangular ovate with a red-tinged margin and are more or less clasping  Leaf surfaces are blue-green and glaucous above and pale green and glabrous below. At last some specimens in Fort Ord may be hybrids with Toro Manzanita (Arctostaphylos montereyensis).

Sandmat Manzanita – Arctostaphylos pumila

Blooms:

Feb–Apr

Plant Height:

1–10 dm

Flower Size:

Medium cluster

Origin:

Native

Rare or Endangered?

Yes – 1.b2

Habitat:

Sandy places near Monterey Bay

Notes:

Another Monterey County endemic.  One of the  smallest manzanitas, it forms a low mound (like Hooker’s Manzanita (Arcotstaphylos hookeri)) but can be distinguished from it by the color and size of its leaves.  These are very small (1–2 cm), mid-green with a bluish tinge, glabrous above and blue-tomentose below (at least when young).  The leaf base is wedge-shaped and the tip obtuse.  It has no burl.

Mexican Manzanita – Arctostaphylos pungens

Blooms:

Feb–Mar

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Mainly around the Indians, widely distributed outside Monterey County

Notes:

This manzanita has no burl.  Leaves are erect, bright or dark green on both surfaces, more or less elliptic and with an obtuse to wedge-shaped base. Ovaries and fruits are glabrous, the latter somewhat flattened and 5–8 mm across. One of the two species of manzanita found in the Pinnacles.

Monterey Manzanita – Arctostaphylos tomentosa subsp. bracteosa

Blooms:

Dec–Mar

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Chaparral, conifer forest

Notes:

This species of manzanita has a prominent burl and flaking bark.  It is similar to Shaggy-barked Manzanita (subsp. tomentosa) except that its leaves are not tomentose below and twigs and inflorescences are densely glandular-hairy.

Shaggy-barked Manzanita – Arctostaphylos tomentosa subsptomentosa

Blooms:

Dec–Mar

Plant Height:

1–3 m

Flower Size:

Medium cluster

Origin:

Native

Habitat:

Chaparral, conifer forest

Notes:

This species of manzanita has a prominent burl and flaking bark which gives this subspecies its common name. Leaves are green above but white-tomentose below. Leaves, twigs and flowers all have sparse, short, non-glandular hairs.