Stenorrhynchos michuacanum

(La Llave & Lexarza) Lindley

Gen. Sp. Orchid. Pl., 478. 1840.

Illustrated
Basionym: Neottia michuacana La Llave & Lexarza Nov. Veg. Descr. 2: Orchid. Opusc., 3. 1825
Synonyms: Spiranthes michuacana (La Llave & Lexarza) Hemsley
Treatment appears in FNA Volume 26.

Plants 13–80 cm. Roots 4–10 × 3–6 mm. Stems: sheaths 3–6, cauline, bladeless, striate, scarious, glabrous. Leaves 0–5, mostly basal; distinct petiole absent; blade lanceolate, 10–50 × 1–3 cm. Inflorescences 5–19 cm; floral bracts green basally, becoming reddish-brown apically, elliptic, 21–32 × 15 mm, apex acute or acuminate; basal portions of bracts, rachis, and outer surfaces of sepals densely hairy with many-septate, tapered, tortuous hairs. Flowers cream or white; perianth parts with 1 or more longitudinal green stripes or markings; sepals lanceolate, 9–20 × 3.6–7 mm, apex acute to mucronate; dorsal sepal 15–18 mm; petals lanceolate, 9–20 × 4–5 mm, base arcuate, apex acute; lip 8–16 × 5.2–7.9 mm, with short basal claw ca. 1 mm; column 8–10 mm; anther cap 7–8 mm; pollinaria 8 mm; rostellum needlelike, 4 mm; pedicellate ovary 7–10 mm. Capsules ascending, ovoid.


Phenology: Flowering Sep–Feb.
Habitat: Open grassy slopes, sand pine-oak woodlands, especially in zones of periodic seepage
Elevation: 1900–2200 m

Discussion

In the flora Stenorrhynchos michuacanum grows in the Huachuca and Santa Catalina mountains of Arizona and the Chisos and Chinati mountains of Texas. This rather robust species has stems 2–10 mm thick. The flowers are densely hairy externally with many-septate, tapered, tortuous hairs. Recent field work (R. A. Coleman 1996) has shown that the species is more frequent than previously thought.

Selected References

None.

Lower Taxa

None.
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
self-pollination +
acute +  and mucronate +
Paul M. Catling +  and Paul Martin Brown +
(La Llave & Lexarza) Lindley +
cordate +  and truncate +
Neottia michuacana +
indehiscent +
not +  and articulate +
conduplicate +  and plicate +
10 cm100 mm <br />0.1 m <br /> (50 cm500 mm <br />0.5 m <br />) +
lanceolate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not inflated +
extended +
8mm +  and 10mm +
Ariz. +, Tex. +  and Mexico +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1900–2200 m +
reddish-brown +  and green +
2.1 cm21 mm <br />0.021 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
3-merous +, sessile +  and pedicellate +
white +  and cream +
Open grassy slopes, sand pine-oak woodlands, especially in zones of periodic seepage +
many-septate +
tortuous +
tapered +
lateral +  and terminal +
5 cm50 mm <br />0.05 m <br /> (19 cm190 mm <br />0.19 m <br />) +
petiolate +, sessile +  and simple +
duplicate +, convolute +, whorled +, opposite +, distichous +  and alternate +
0 (?) +  and 5 (?) +
reduced +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
elliptic-lanceolate +
larger +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.79 cm7.9 mm <br />0.0079 m <br />) +
green stripes +
differing in form and color +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1-many-flowered +  and cymose +
pendent +  and erect +
free +  and distinct +
9mm;20mm +
lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering Sep–Feb. +
8 cm80 mm <br />0.08 m <br /> (?) +
Gen. Sp. Orchid. Pl., +
0.4 cm4 mm <br />0.004 m <br /> (?) +  and 1 cm10 mm <br />0.01 m <br /> (?) +
aerial +  and subterranean +
3mm +  and 6mm +
4 cm40 mm <br />0.04 m <br /> (?) +
minute +
free +, distinct +, adnate +  and connate +
lanceolate +
foliaceous +
not +  and alike +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Illustrated +
branched +, or +  and simple +
pendent +  and erect +
proliferous +
thickened +  and stout +
concave +  and convex +
Spiranthes michuacana +
Stenorrhynchos michuacanum +
Stenorrhynchos +
species +
aquatic +, lithophytic +, terrestrial +  and epiphytic +
saprophytic +, photosynthetic +  and mycotrophic +