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Name: Dirt
(Zone 5b)
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dirtdorphins
Jan 25, 2016 12:48 AM CST
Any Spiraea experts?

Van Houtte Spiraea (Spiraea x vanhouttei)

As far as I know Spiraea x vanhouttei doesn't have double flowers and lance-shaped leaves
http://plants.usda.gov/core/profile?symbol=SPVA2&photoID=spv...

Leaf Description- Small, simple rhombic to obovate, dark blue-green alternate leaves that are 1.5- 3.8 cm long with an acute apex and 3 -5 lobes with irregular teeth.
Flower Description- The showy umbels with numerous individual flowers are 2.5-5 cm in diameter and are borne at the apex of the branches.
Spiraea cantoniensis Lour. ×S. trilobata L. Spiraea ×‌vanhouttei (Briott) Carr. is frequently planted (though rarely escaped) meadowsweet hybrid known from CT, MA. It is similar to S. chamaedryfolia in that the flowers are borne in peduncled umbels that are produced on short shoots. The hybrid differs from that species in its stamens not exceeding the petals in length (vs. stamens longer than the petals), its erect to spreading sepals (vs. recurved), and glabrous follicles (vs. pubescent). Spiraea ×‌vanhouttei is further characterized by its leaf blades that are often obscurely 3- to 5-lobed.

From a key
1. Inflorescence a simple umbel; plants flowering early to mid-spring (Mar–Apr)...2. [exotic]
2'. Flowers 6–10 mm in diam...4.
4'. Leaf blades ovate to obovate, 3–5 cm x 2–3 cm, < 2x as long as wide; flowers 7–10 mm in diameter...S. x vanhouttei

I have seen double flowered versions sold as Spiraea prunifolia and Spiraea thunbergii
and we also have
Double Bridal Wreath Spiraea (Spiraea cantoniensis)

any of which may be the more applicable entry for many of the images currently displayed under x vanhouttei

but I really don't know...
Name: Zuzu
Northern California (Zone 9a)
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zuzu
Jan 25, 2016 2:24 AM CST

Plants Admin

I'm interested in this, particularly because half of the photos in the S. x vanhouttei entry are ones that Sue and I took in my garden. I bought the plant years and years ago as S. x vanhouttei, but I'm willing to entertain the notion that it was misnamed.

I'm not sure about the other possibilities you mention, though, DD. The blooms of the photos Larry and Paul added to the S. cantoniensis entry show a green center my blooms have never exhibited, and they're also a different shape.

S. prunifolia also looks wrong because of the yellow centers and the different shape of the blooms and of the bush itself.

The only photo we have of S. thunbergii also looks nothing like my Spiraea.

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