The Plants of Michigan Part 48

61a. Pods widely spreading; stem usually sparingly branched near the base (spring) =Rock Cress, Arabis dentata.=

61b. Pods erect or appressed; stem usually unbranched (summer) --62.

62a. Stem-leaves and stem smooth and glaucous =Rock Cress, Arabis glabra.=

62b. Stem-leaves and stem almost always p.u.b.escent, and never glaucous =Rock Cress, Arabis hirsuta.=

63a. Princ.i.p.al stem-leaves 7-10 cm. long, or more --64.

63b. Princ.i.p.al stem-leaves 2-5 cm. long --65.

64a. Leaves lanceolate or oblong; flowers 10 mm. wide or less (3-7 dm. high; summer) =Rock Cress, Arabis canadensis.=

64b. Leaves ovate or ovate-lanceolate; flowers 15-20 mm. wide (5-8 dm. high; late spring and summer) =Dame's Rocket, Hesperis matronalis.=

65a. Basal leaves ovate to orbicular or cordate, not more than twice as long as broad (1-3 dm. high; spring) (Bitter Cress) --66.

65b. Basal leaves oblong, lanceolate, or oblanceolate, at least 3 times as long as broad (1-3 dm. high) --67.

66a. Flowers purple or rose color =Bitter Cress, Cardamine dougla.s.sii.=

66b. Flowers white =Bitter Cress, Cardamine bulbosa.=

67a. Basal leaves pinnatifid (spring and summer) =Rock Cress, Arabis lyrata.=

67b. Basal leaves entire or toothed --68.

68a. Leaves narrowly oblanceolate; rare plant occurring from Mackinac northward (summer) =Rock Cress, Braya humilis.=

68b. Leaves obovate or oblong; an introduced weed (spring) =Mouse-ear Cress, Sisymbrium thalianum.=

CAPPARIDACEAE, the Caper Family

Herbs, with alternate compound leaves, 4 petals, and 6 or more stamens, which are about equal in length; fruit a 1-celled pod.

One species in Michigan, stamens about 11; leaflets 3 (2-4 dm. high; flowers yellowish, in summer) =Clammy-weed, Polanisia graveolens.=

RESEDACEAE, the Mignonette Family

Herbs, with alternate leaves and terminal racemes of small yellowish flowers; sepals 6, petals 6, stamens numerous.

One species in Michigan, with divided leaves and irregularly cleft petals, blooming in summer =Yellow Mignonette, Reseda lutea.=

SARRACENIACEAE, the Pitcher Plant Family

Insectivorous plants, with hollow, pitcher-shaped leaves, and large purple flowers at the ends of naked stems.

One species in Michigan, growing in bogs and blooming in late spring =Pitcher Plant, Sarracenia purpurea.=

DROSERACEAE, the Sundew Family

Insectivorous herbs, with a rosette of basal leaves bearing gland-tipped bristles on their upper surface, and with slender racemes of small white flowers in summer; inhabitants of bogs and swamps (2 dm. high, or less).

1a. Leaf-blade about as long as wide =Sundew, Drosera rotundifolia.=

1b. Leaf-blade about 2-3 times as long as wide =Sundew, Drosera longifolia.=

1c. Leaf-blade about 5-8 times as long as wide =Sundew, Drosera anglica.=

1d. Leaf-blade narrowly linear, about 10 times as long as wide =Sundew, Drosera linearis.=

PODOSTEMACEAE, the River Weed Family

Small submerged aquatics, growing attached to stones in running water, with dissected leaves and minute flowers.

One species in Michigan =River Weed, Podostemum ceratophyllum.=

CRa.s.sULACEAE, the Orpine Family

Herbs, with usually alternate leaves; the sepals, petals, and pistils each 4 or 5, or in one species the petals none, and the stamens as many or twice as many as the sepals.

1a. Leaves entire (Stonecrop) --2.

1b. Leaves toothed --3.