Life Sciences Commons^™

Morphology And Distribution Of Petiolar Nectaries In Ipomoea (Convolvulaceae), Kathleen H. Keeler, Robert B. Kaul

School of Biological Sciences: Faculty Publications

The distribution of petiolar nectaries in 24 species of Ipomoea was investigated. Petiolar nectaries were found on 12 species (8 new reports, 4 confirmations of previous reports) and quoted from the literature as being found on 3 other species; they were absent from 9 species investigated. The structure of petiolar nectaries in the genus ranges from simple beds of superficial nectar-secreting trichomes (1 species), to slightly recessed "basin nectaries" (8 species), to "crypt nectaries," which are structurally the most complex extrafloral nectaries known (3 species). (Structures were not determined for 3 species.) Petiolar nectaries are present in all subgenera, but …

Distribution Of Plants With Extrafloral Nectaries And Ants At Two Elevations In Jamaica, Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Frequencies of plants with extrafloral nectaries were determined for two elevations in Jamaica. Extrafloral nectaries were found on 0.28 of the plants at sea level (Happy Grove, Portland) and 0.00 of the plants at 1310 m (Whitfield Hall, St. Thomas). Ant abundance, as indicated by discovery of and recruitment to baits, was greater at the lower elevation site. However, despite the apparent absence of plants with extrafloral nectaries, there were abundant ants at 1310 m.

Ecotypic Differentiation Of Andropogon Virginicus L. In Relation To Strip Mine Spoil Banks, Valina Kay Hurt

Masters Theses & Specialist Projects

Reciprocal plantings of populations of broomsedge, taken from an abandoned strip mine and from an abandoned farm plot in south central Kentucky, on strip mine spoil and abandoned field soil resulted in patterns of populations differentiation. Clonal plantings of populations from strip mine habitats and old field development appeared equal in height and biomass when grown on old field soils in both field trials and growth chamber studies. Populations when planted in strip mine soils in field trials and controlled growth experiments. Later flowering in strip mine populations may be a key to survival strategy in the harsh microclimates of …

A Taxonomic & Physiographic Survey Of Scirpus In Kentucky With Problem Species Complex Analysis, Sally Arnold

Masters Theses & Specialist Projects

The genus Scirpus was analyzed according to species occurrence and physiographic distribution in the State of Kentucky. The morphology of three taxonomic problem complexes, Scirpus atrovirens-georgianus, Scirpus validus-acutus, and Scirpus cyperinus-eriophorum-pelius-pedicellatus was evaluated to determine whether or not their components are distinct among the Kentucky specimens. Remaining taxa were likewise evaluated and identified. A key to Scirpus in Kentucky and a taxonomic treatment are presented.

Species With Extrafloral Nectaries In A Temperate Flora (Nebraska), Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Extrafloral nectaries (EFNs) are glands on a plant, not involved in pollination, that produce solutions containing sugars (and other compounds). Long noted by morphologists, EFNs have recently been observed to be part of ant-plant mutualisms. The function of EFNs appears to be to attract aggressive insects, especially ants, which by disturbing or preying upon herbivores, reduce damage to the plant (Janzen, 1966a,b; Elias and Gelband, 1975; Keeler, 1975, 1977; Bentley, 1976, 1977a,b; Schemske, 1978; Tilman, 1978; Inouye and Taylor, 1979; Pickett ad Clark, 1979). Furthermore, they constitute an unusual plant defense against herbivores: at EFNs plants employ ants as a …

Spring 1979 Conference Issue, K. A. Hurto, Alfred W. Boicourt, W. A. Sinclair, E. S. Pira

Turf Bulletin

1. Principles of Turfgrass Weed Control Annual Grasses (page 3)
2. Bean-Shape Islands (7)
3. High Protein Food From Grass (8)
4. Forty-Eighth Annual Turf Conference and Third Industrial Show Program (10)
5. "Dutch Elm Disease: Perspectives After 60 Years" (13)
6. Toro Irrigation Design Seminar (14)
7. Ideas: New and Old (15)
8. More Pesticide Exams (16)
9. Disposal of Pesticides in Massachusetts (18)
10. Moth Controls Nutsedge Weeds (19)
11. New Pesticide Bill (20)

Fall 1979, Walter C. Shortle, Jeff Cox, Francis W. Holmes, Clifford S. Chater, Anthony Decrosta

Turf Bulletin

1. New Ideas in Tree Care (page 3)
2. 'Wonder Water' (6)
3. Herbicides: Are They Safe? (9)
4. University of Massachusetts Turfgrass Field Day (10)
5. The Shade Tree Laboratories of Massachusetts--Origin and Public Services (11)
6. Do Pesticides Cause Allergies (14)
7. Federal Noxious Weed Act Funded (18)
8. Your Opinion Please (18)

Summer 1979, Joseph Troll, K. A. Hurto

Turf Bulletin

1. Fertilizer Programs for Bluegrass and Ryegrasses (page 3)
2. Turfgrass Slide Sets Available (6)
3. Seed Extracts Repel Japanese Beetles (8)
4. Principles of Turfgrass Weed Control (10)
5. How Regulation is Impacting on Pesticide Research (12)
6. UMass Turfgrass Research Fund (20)
7. UMass Turfgrass Research Field Day (20)

Winter 1979, John Tristan, Joe Don Boyd, Fred P. Miller, K. A. Hurto, Pat Kristy, Joseph Troll

Turf Bulletin

1. Clubhouse Plants (page 3)
2. Massachusetts Pesticide News (6)
3. The Alsea Report on 2,4,5-T (8)
4. Better Pest Control (10)
5. Acid Rain: Something Else to Worry About? (11)
6. UMass Turfgrass Research Update (13)
7. 1979 Preemergence Crabgrass Control Trial

Nocturnal Pollination Of Abronia Fragrans (Nyctaginaceae), Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Abronia fragrans Nutt. (Nyctaginaceae) is a white-flowered herb of dry sandy soils from Idaho and South Dakota to Arizona and Texas. It can be readily observed to fit a night-blooming, moth-pollinated syndrome (Faegri and van der Pijl, The principle of pollination ecology, 1971). This does not seem to have been noted: in all references to A. fragrans we could find, the only indication of nocturnal anthesis was the comment of Nelson (Handbook of Rocky Mountain plants, 1969), who observed that the fragrance was more noticeable at night. Tillett (Brittonia 19:299-327, 1967), working on Pacific species, suggested that the pink …