rosinweed

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Related to rosinweed: compass plant, Silphium laciniatum

rosinweed:

see compass plantcompass plant
or rosinweed,
large, coarse North American perennial herb (Silphium laciniatum) of the family Asteraceae (aster family), found chiefly in open grasslands. The deeply cut leaves tend to point north and south.
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prarie dock

Yellow daisy-type flowers on tall leafless stem that can reach 10 ft (3m), taller than a person with HUGE heart/spade shaped thick, coarse, sandpapery leaves around base of plant. Top of young leaves shiny. Stalk can be green or reddish pink. Has smelly gummy sap that smells like turpentine and can be used as chewing gum to freshen breath and prevent nausea. Related to cup plant. Young leaves and shoots used in salads, roots used medicinally for fever, asthma, spleen, heart, liver, gallbladder, bile, cholesterol, antiseptic, stopping bleeding (astringent), ulcers, heavy menstrual periods, bruising, rheumatism.

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Gall-wasp attack and nutrient and water availability were manipulated in rosinweed established in an experimental garden near the field site to determine how variation in plant resource availability influenced plant responses to gall-insect attack under competition-free conditions.

Rosinweed rhizomes for transplant came from the field experiment site.

- Galls had generally negative effects on field rosinweed. Galling reduced plant height and total leaf area, and caused earlier leaf and shoot senescence, and higher late-season stomatal conductance ([ILLUSTRATION FOR FIGURE 1 OMITTED], Table 1).

- Galling doubled rosinweed aboveground biomass (Table 2).

- In general, galls were considerably less damaging to rosinweed than under typical field conditions.

- Unlike in field plants, galling reduced total rosinweed biomass by 20% ([ILLUSTRATION FOR FIGURE 6 OMITTED], Table 4).

Rosinweed's tolerance of galling by Antistrophus silphii depended on the conditions in which their interaction occurred.

In contrast, in the field experiment rosinweed's responses indicated much less tolerance of galls.

Resources, competition, and the galls themselves appear to have constrained a tolerance-enhancing axillary regrowth response in galled field rosinweed. Resources clearly limited rosinweed's regrowth response, since water and fertilizer strongly increased axillary biomass.

Axillary growth limitation by galls is also suggested because other kinds of meristem damage (e.g., browsing by deer) typically stimulate axillary growth in field rosinweed (P.

Gall wasps were mostly unaffected by changes in competition and resources that so strongly affected rosinweed's tolerance of gall damage.