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The Plants of Michigan: Simple Keys for the Identification of the Native Seed Plants of the StateGleason, Henry A. (Henry Allan)

Science

The Plants of Michigan: Simple Keys for the Identification of the Native Seed Plants of the State

Name: The Plants of Michigan: Simple Keys for the Identification of the Native Seed Plants of the State
Author: Gleason, Henry A. (Henry Allan)

Gleason, Henry A. (Henry Allan)

Plants -- Michigan

24b. Leaves 2 (-20 cm. high; late spring)
                                     =Showy Orchis, Orchis spectabilis.=

25a. Lip about 10 mm. long, purple     =Tway-blade, Liparis liliifolia.=

25b. Lip about 5 mm. long, yellowish-green
                                         =Tway-blade, Liparis loeselii.=

     26a. Perianth 8-10 mm. long; lip with elongated point
                            =Rattlesnake Plantain, Epipactis decipiens.=

     26b. Perianth 4-6 mm. long; lip sack-like --27.

27a. Raceme loosely flowered, one-sided
                =Rattlesnake Plantain, Epipactis repens var. ophioides.=

27b. Raceme closely flowered, not one-sided
                            =Rattlesnake Plantain, Epipactis pubescens.=

     28a. Lip conspicuously sack-like, inflated (late spring and early
          summer) (Lady's Slipper) --29.

     28b. Lip not sack-like nor inflated --32.

29a. Lip white (1-3 dm. high)
                           =White Lady's Slipper, Cypripedium candidum.=

29b. Lip yellow (2-7 dm. high) --30.

29c. Lip white, with crimson or purple markings --31.

29d. Lip pink (1-4 dm. high, late spring)
                          =Stemless Lady's Slipper, Cypripedium acaule.=

     30a. Lip 2-3 cm. long.
                 =Small Yellow Lady's Slipper, Cypripedium parviflorum.=

     30b. Lip 3.5-5 cm. long
  =Large Yellow Lady's Slipper, Cypripedium parviflorum var. pubescens.=

31a. Lip 2 cm. long or less; sepals separate (1.5-3 dm. high)
                     =Ram's Head Lady's Slipper, Cypripedium arietinum.=

31b. Lip 3 cm. long or more; the 2 lower sepals united
                           =Showy Lady's Slipper, Cypripedium hirsutum.=

     32a. Flowers solitary in the axils, or solitary and terminal; not
          spurred --33.

     32b. Flowers in terminal racemes, spurred --38.

33a. Leaves a whorl of 5 (2-3 dm. high; petals greenish; late summer)
                                =Whorled Pogonia, Pogonia verticillata.=

33b. Leaves alternate --34.

     34a. Leaves lanceolate or narrowly ovate, 2-8 cm. long, narrowed at
          base; flower terminal (1-4 dm. high; flowers pink purple,
          early summer)          =Snake Mouth, Pogonia ophioglossoides.=

     34b. Leaves ovate, 1-2 cm. long, clasping; flowers axillary (5-20
          cm. high; flowers purple, summer)
                               =Nodding Pogonia, Pogonia trianthophora.=

35a. Leaf basal; spur nearly straight
                                      =Rein Orchis, Habenaria obtusata.=

35b. Leaf on the stem; spur strongly curved
                                    =Rein Orchis, Habenaria clavellata.=

     36a. Flower-stalk without bracts below the raceme; flowers
          yellowish-green              =Rein Orchis, Habenaria hookeri.=

     36b. Flower-stalk bearing bracts below the raceme; flowers
          greenish-white --37.

37a. Spur 15-25 mm. long            =Rein Orchis, Habenaria orbiculata.=

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The Plants of Michigan: Simple Keys for the Identification of the Native Seed Plants of the State

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