Exochorda

Lindley

Gard. Chron. 1858: 925. 1858.

Common names: Pearlbrush
Introduced
Etymology: Greek exo -, outside, and chorde, string, alluding to free placentary cords external to carpels
Treatment appears in FNA Volume 9. Treatment on page 384. Mentioned on page 385.
 TaxonIllustrator 
FNA9 P31 Prunus hortulana.jpegPrunus hortulana
Exochorda racemosa
Oemleria cerasiformis
Marjorie C. Leggitt
Marjorie C. Leggitt
Marjorie C. Leggitt

Shrubs, to 30 (–50) dm. Stems 1–20+, spreading to erect; bark brown to gray-brown on branches, not exfoliating; short-shoots absent; glabrous or sparsely hairy in early season. Leaves deciduous, cauline, alternate; stipules usually absent; petiole present, sometimes relatively short; blade elliptic or oblong to oblong-obovate, 1.5–4.4 (–6) [–9] cm, membranous, margins flat, entire or serrate in distal 1/2, surfaces glabrous or hairy. Inflorescences terminal, 4–10-flowered, racemes, axes glabrous or sparsely hairy prior to expansion of flowers; bracts present; bracteoles present. Pedicels present. Flowers bisexual (plants synoecious), appearing with leaves, 25–50 mm diam.; hypanthium shallowly campanulate to obturbinate, 3.5–4.2 mm, glabrous; sepals 5, ascending, triangular to broad-triangular or semiorbiculate; petals 5, white, [oblong] obovate to suborbiculate, base clawed; stamens 15–20 [–30], shorter than petals; torus absent; carpels 5, connate, glabrous, styles 5; ovules 1 or 2. Fruits capsules, semicircular in outline, shorter than wide or as tall as wide in side view, 6–10 [–15] mm, glabrous; hypanthium not persistent; sepals not persistent. Seeds 1 or 2 per capsule, winged. x = 8.

Distribution

Introduced; Asia, also in Europe, Australia

Discussion

Species 4 (1 in the flora).

Species of Exochorda are attractive, spring-flowering shrubs with racemes of showy, white flowers, and are commonly planted.

Selected References

None.

Lower Taxa

"thin" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Exochorda"
Arthur Haines +
Lindley +
hairy +  and glabrous +
brown +  and gray-brown +
not exfoliating +
compound +  and simple +
opposite +  and alternate +
4.4 cm44 mm <br />0.044 m <br /> (6 cm60 mm <br />0.06 m <br />) +
oblong +  and oblong-obovate +
1.5 cm15 mm <br />0.015 m <br /> (4.4 cm44 mm <br />0.044 m <br />) +
membranous +
Pearlbrush +
Asia +, also in Europe +  and Australia +
not +  and aggregated +
Greek exo -, outside, and chorde, string, alluding to free placentary cords external to carpels +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
not +  and aggregated +
not +  and aggregated +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not +  and aggregated +
not persistent +
shallowly campanulate +  and obturbinate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
crassinucellate +
deciduous +
serrate +  and entire +
toothed +, unlobed +  and lobed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
2 +  and 1 +
0 (?) +  and 4 (?) +
free +  and distinct +
obovate;suborbiculate +
adnate +, free +, connate +  and distinct +
Gard. Chron. +
not persistent +
free +  and distinct +
triangular +  and broad-triangular or semiorbiculate +
hairy +  and glabrous +
Introduced +
free +  and distinct +
branched +  and simple +
spreading +  and erect +
1 +  and 20 +
not persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
hairy +  and glabrous +
Exochorda +
Rosaceae tribe Exochordeae +
inconspicuous +