WorldFloraDB - Silphium terebinthinaceum

Characteristics

Taprooted; stem 0.7–3 m, essentially glabrous, nearly naked, its lvs, except those near the base, few and reduced to mere large bracts; principal lvs large, long-petiolate, the blade narrowly to broadly ovate, oblong, or elliptic, usually cordate (seldom only subtruncate) at the base, 1–5 × 0.7–3 dm, usually sharply toothed, glabrous or scabrous, sometimes hirsute on the midrib beneath; heads several or rather numerous in an open-corymbiform infl, relatively large, with ca 13 to ca 21 rays 2–3 cm, the disk 1.5–3.5 cm wide; invol 13–25 mm, its bracts essentially glabrous, strongly imbricate, the outer broadly elliptic, the inner elongate, more oblong, loose and broad-tipped; 2n=14. Prairies; s. Ont. and O. to Minn., s. to Ga. and Miss. July–Sept. (S. rumicifolium)

More

Plants scapiform, (40–)100–250+ cm; taprooted. Stems terete, glabrous. Leaves: basal persistent, petiolate; cauline alternate, petiolate or sessile; blades cordate, deltate, lanceolate, ovate, or sagittate, 3–40 × 1–40 cm, sometimes (proximal) pinnately lobed, bases attenuate, cordate, hastate, round, or truncate, ultimate margins coarsely toothed or entire, apices acuminate, acute, or obtuse, faces glabrous or scabrous. Phyllaries 23–33 in 2–3 series, outer appressed, apices obtuse to acute, abaxial faces glabrous. Ray florets 17–29; corollas yellow. Disc florets 120–140; corollas yellow. Cypselae 7–13 × 4–10 mm; pappi 0–1 mm.

Life form

perennial

Growth form

herb

Growth support

free-standing

Foliage retention

deciduous

Sexuality

hermaphrodite

Pollination

entomogamy

Spread

-

Mature width (meter)

0.75 - 1.0

Mature height (meter)

1.5

Root system

tap-root

Rooting depth (meter)

1.4

Root diameter (meter)

-

Flower color

Blooming months

Jan	Feb	Mar
Apr	May	Jun
Jul	Aug	Sep
Oct	Nov	Dec

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

c3

Environment

Prairies, dry woods and glades. Wet or dry prairies, fens, disturbed sites free of underbrush; at elevations from 100-500 metres.

Light
Soil humidity
Soil texture
Soil acidity
Soil nutriment	-
Hardiness (USDA)

Usage

Uses	gum medicinal
Edible	-
Therapeutic use	-
Human toxicity	-
Animal toxicity	-

Cultivation

Can be grown by divisions or seedlings.

Mode	divisions seedlings
Germination duration (days)	-
Germination temperacture (C°)	20
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-33
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-