The Plants of Michigan - LightNovelsOnl.com
You're reading novel online at LightNovelsOnl.com. Please use the follow button to get notifications about your favorite novels and its latest chapters so you can come back anytime and won't miss anything.
16b. Basal leaves toothed, lobed, or pinnatifid (spring and summer) --17.
17a. Heads 8-14 mm. wide (1-4 dm. high) =Dwarf Dandelion, Krigia virginica.=
17b. Heads 25-50 mm. wide (1-6 dm. high) (Dandelion) --18.
18a. Outer involucral bracts reflexed =Dandelion, Taraxac.u.m officinale.=
18b. Outer involucral bracts erect or spreading =Dandelion, Taraxac.u.m erythrospermum.=
19a. Pappus none; heads about 1 cm. wide (4-10 dm. high; summer) =Nipplewort, Lapsana communis.=
19b. Pappus of an inner row of bristles and an outer row of short scales; heads about 3 cm. wide (3-8 dm. high; early summer) =Cynthia, Krigia amplexicaulis.=
19c. Pappus of feathery bristles (summer) --20.
19d. Pappus of simple bristles --25.
20a. Flower-stalk scaly, without foliage leaves (2-6 dm. high) =Fall Dandelion, Leontodon autumnalis.=
20b. Stem leafy (3-10 dm. high) --21.
21a. Leaves entire, linear-lanceolate =Meadow Salsify, Tragopogon pratensis.=
21b. Leaves serrate, oblong-lanceolate =Picris, Picris hieracioides.=
22a. Pappus tawny in color (1-3 m. high) --23.
22b. Pappus white --24.
23a. Leaves pinnatifid =Wild Lettuce, Lactuca spicata.=
23b. Leaves undivided, dentate =Wild Lettuce, Lactuca spicata var. integrifolia.=
24a. Upper leaves entire; heads about 1.5 cm. wide (5-10 dm. high) =Wild Lettuce, Lactuca pulch.e.l.la.=
24b. Upper leaves dentate or lobed; heads about 1 cm. wide (1-3 m.
high) =Wild Lettuce, Lactuca floridana.=
25a. Achene tipped with a slender beak, bearing the pappus at its summit (summer) (Wild Lettuce) --26.
25b. Achene without a beak --29.
26a. Leaves hirsute or hispid on the mid-veins beneath --27.
26b. Leaves glabrous --28.
27a. Leaves p.u.b.escent on both sides (1-2 m. high) =Wild Lettuce, Lactuca hirsuta.=
27b. Leaves glabrous, except on the mid-vein (5-15 dm. high) =Wild Lettuce, Lactuca scariola var. integrata.=
28a. Leaves entire or spa.r.s.ely toothed (1-2 m. high) =Wild Lettuce, Lactuca sagittifolia.=
28b. Leaves chiefly sinuate-pinnatifid (1-3 m. high) =Wild Lettuce, Lactuca canadensis.=
29a. Flowers white, cream-color, or purplish (summer and autumn) (Rattlesnake Root) --30.
29b. Flowers bright-yellow or orange --33.
30a. Heads nodding (6-20 dm. high) --31.
30b. Heads pointing in various directions, in spike-like panicles; involucres p.u.b.escent (5-15 dm. high) =Rattlesnake Root, Prenanthes racemosus.=
31a. Heads with 5-7 flowers in each =Rattlesnake Root, Prenanthes altissima.=
31b. Heads with 8-12 flowers --32.
31c. Heads with 20 or more flowers =Rattlesnake Root, Prenanthes crepidinea.=
32a. Pappus dark reddish-brown =Rattlesnake Root, Prenanthes alba.=
32b. Pappus pale-brown or nearly white =Rattlesnake Root, Prenanthes trifoliata.=
33a. Pappus tawny or brown in color (summer and autumn) (Hawkweed) --34.
33b. Pappus white --42.
34a. Heads 2.5 cm. in diameter, or larger --35.
34b. Heads 1-2 cm. in diameter (4-10 dm. high) --37.
35a. Leaves all basal (1-4 dm. high) =Hawkweed, Hieracium pilosella.=
35b. Stem-leaves present (4-15 dm. high) --36.
36a. Leaves rounded at the sessile base =Hawkweed, Hieracium canadense.=
36b. Leaves narrowed toward the base =Hawkweed, Hieracium umbellatum.=
37a. A rosette of basal leaves conspicuous at flowering time --38.
37b. No rosette of basal leaves at time of flowering --41.
38a. Leaves glabrous on the upper side --39.
38b. Leaves hairy on the upper side --40.
39a. Stem glabrous, leafless or with one or two leaves =Hawkweed, Hieracium venosum.=
39b. Stem with several leaves, hairy below =Hawkweed, Hieracium marianum.=
