Flora of North America species comparison

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Platanthera dilatata

bog candles, bog-candle, boreal bog-orchid, fragrant white bog orchid, fragrant white rein orchid, rein orchid, scent-bottle, white bog orchid, white northern bog-orchid, white orchid, white rein-orchid
Habit Plants 11–130 cm or more.
Leaves

few–several, ascending to recurved-spreading, scattered along stem, gradually reduced to bracts distally;

blade linear, linear-lanceolate, oblong, or oblanceolate, 3.5–32 × 0.3–7 cm.
Spikes

very lax to very dense.
Flowers

resupinate, rather showy, conspicuous, white;

lateral sepals spreading to reflexed;

petals ovate- to linear-lance-falcate, margins entire;

lip descending or apex adhering to dorsal sepal and petal apices, linear-lanceolate to lanceolate, without basal thickening, 4–11 × 2–5 mm, base slightly rounded-dilated to orbiculate, rarely rhombic, margins entire;

rostellum lobes parallel to slightly divergent, directed downward, very small, obscure, rounded;

pollinaria straight;

pollinia remaining enclosed in anther sacs;

ovary rather slender to stout, 5–15 mm.
2n

= 42.

Platanthera dilatata
Distribution
from USDA
North America
[WildflowerSearch map]
Discussion

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Spur shorter than lip, clavate to slightly capitate.
var. albiflora
1. Spur nearly equaling to exceeding lip, slender to slightly clavate.
→ 2
2. Spur about equal to lip (mostly within 2 mm).
var. dilatata
2. Spur markedly exceeding lip (commonly 11/2 or more times length of lip).
var. leucostachys
Source FNA vol. 26, p. 556. Treatment author: Charles J. Sheviak.
Parent taxa Orchidaceae > subfam. Orchidoideae > tribe Orchideae > subtribe Orchidinae > Platanthera
Sibling taxa
P. aquilonis, P. blephariglottis, P. brevifolia, P. chapmanii, P. chorisiana, P. ciliaris, P. clavellata, P. convallariifolia, P. cristata, P. flava, P. grandiflora, P. hookeri, P. huronensis, P. hyperborea, P. integra, P. integrilabia, P. lacera, P. leucophaea, P. limosa, P. macrophylla, P. nivea, P. obtusata, P. orbiculata, P. peramoena, P. praeclara, P. psycodes, P. purpurascens, P. sparsiflora, P. stricta, P. tipuloides, P. zothecina
Subordinate taxa
P. dilatata var. albiflora, P. dilatata var. dilatata, P. dilatata var. leucostachys
Synonyms Orchis dilatata, Habenaria dilatata, Limnorchis dilatata
Name authority (Pursh) Lindley ex L. C. Beck: Bot. North. Middle States, 347. (1833)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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