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Colorado Native Plant Society • uze• za Newsletter of tbe Colorado Native Plant Society " ... dedicated to the appreciation and conservation of the Coloraqo native flora" ·V(jIUro¢>20· •••• ••· •• Nprnbgt· •• 1 Botanical Notes from the Arkansas Valley II: the Ecology of Oxybaphus rotundifolius Tass Kelso, Kirsten Heckmann, Reproduction exclosures equaling seed set in open polli­ John Lawton, and George Maentz In general, Oxybaphus rotundifolius popu­ nated plants. However, seed predation by Dept. of Biology, Colorado College lations had an excellent year, probably due ·insects may be responsible for relativel y low in. part to an unusually wet spring. Plants actual reproductive success: we found ant Increasing concern about developm~nt in bloomed abundantly from early June thieves making off with seeds on a frequent ~he Arkansas River Valley and its potential through late July, with peak bloom in late basis! We also documented extensive her­ impacts on local biota has brought much June. bivory of leaves and inflorescences by needed attention to the botany of this region._ hornworms. Reared hornworm specimens Thanks to funding provided by the Colorado Umbrella-wort flowers open at dawn and pupated and emerged as white-lined Sphinx Natural Areas Program and the Colorado close in response to temperature: on cool moths, Hyles lineata.. Positive insect inter­ Native PIIDl:t Society, this summer we were cloudy days they can remain open into the actions were also noted: we captured able to examine closely some of the endemic late afternoon, but on hot sunny days they pollinators' of several types ranging· from calciphiles of the Middle Arkansas with the close by 9:30 or 10:00 a.m. Typical of the bumblebees to Syrphid flies, all carrying intent of providing a profile of their habitat Nyctaginaceae, each inflorescence contains Oxybaphus pollen. Though self-fertile, this requirements. Oxybaphus rotundifolius (um­ 3-4 flowers sub tended by a papery involu­ species is clearly also a facultative outcrosser. brella-wort), a striking member of the cre. Since each flower has but a single Nyctaginaceae previously known from ovule, seed set per involucre is only 3-4 at Habitat only a few' locations widely scattered be- best. However, most flowers set seed, en­ We consistently found Oxybaphus tween Cafion City and Pueblo, received abling some of the larger plants (almost 2 rotundifolius in sparsely vegetated shale and feet tall this year!) with many involucres to chalk barrens that correspond to the middle particular attention in our study. Technical produce potentially more than 300 seeds. and upper units of the Smoky Hills member assistance from members of the Geology of the Niobrara Fornmtion. A single popula­ and Chemistry Departments at Colorado We discovered that this species is highly tion deviated from this pattern and was found College enabled us to conduct detailed geo­ self-fertilizing, with seed set under insect on the Fort Carson exposure of Ft. Hayes chemical assessments ofOxybaphus habitat; we hoped that this information, coupled with - continued on page 6 the extensive geological information avail­ able for the area, would elucidate the distribution of this species and help us pre­ Contents dict the occurrence of new populations. We 2 Field Trips also studied knpwn Oxybaphus populations From the B9ard 9-12 <.0 identify and document biological compo- Announcements 3-4 Field Trip Lists 13 ~epts of its ecology: pollinator types and Comments on P. versicolor 5 Horticultural Notes 14 dependency, predation, and seed set. Our Spring Workshops 7 Chapter News 15 profile is summarized here. Field Trip Policy 8 Calendar 16 1------------------------------------------------------------------------------------------- Page 2 Aquilegia Volume 20 From the Boar'd of Di'rectors Statewide Represer'tation on the Create two or more regions across the state, cerns, please write to Mark Gershman at the'-J'/ Board of Directors each with board representatives. 2. Change Society's mailing address. You can ais~ the process for electing board members so send your comments via E-mail to: . Do you think that the Society's board should that all members, not just those who attend ([email protected] .us) . have a broader representation? The roster the annual meeting, can vote. This could be (pg. 2) shows that the majority ofthe Society's done with a mail-in ballot. 3. Hol<J board Nomination for Boa~d Members Board of Directors live along the Front meetings throughout the state. 4. Hold the Range, mo~tly in the Fort Collins and the annual meeting somewhere other than the - Although the annual meeting is still several Denver Metropolitan area. In response to Front Range. 5. Gather ideas and comments months off, the Nominations Committee is comments, the Board has discussed ways of from the membership. If you have com­ starting to gather nominations for the Board. increasing representation from other parts of ments, concerns or other ideas about how Nominees should be members of the Society Colorado. Several ideas have emerged:' 1. the Board can best represent statewide con- willing to serve as an officer, Committee - continued on Colorado Native Officers President.. .............. Tom Ranker ............ 492-5074 Plant Society Vice-President... ...... VACANT............... · ................ SecretaI)' ............... Mark Gershman ...... 443-9365 Treasurer ............... Carol Scheid ........... 493-1367 Board of Directors Aquilegia is published four to six times per year Ann Armstrong (97) ...... Boulder ........... 494-0545' by the Colorado Native Plant Society. This David Buckner (97) ....... Boulder ........... 494-3231 newsletter is available to members of the Society Kathy Carsey (96) ......... Boulder ........... 449-3041 and to others with an interest in native plants. Janet Coles (97) ............. Lafayette ......... 604-1378 . I Mark Gershman (96) ..... Boulder .. : ........ 443-9365 The Colorado Native Plant Society is a non- Contact the Society for SUbscription Andrew Kratz (97) ........ Lakewqod ....... 238-6317 t...."II profit organization dedicated to the appreciation information. Paula Lehr (97) ................ Gunnison .......... 641-3236 and conservation of the Colorado native flora. Chris Pague (96) ............ Lyons .............. 492-4719 Membership is open to all with an interest in our Articles from Aquilegia may be used by other Tom Ranker (96) ........... Boulder ........... 492-5074 native plants, ,and is composed of plant native plant societies or non-profit groups if Carol Spurrier (96) ........ Lakewood .. L. 274-6905 enthusiasts both professional and non­ fully cited to author find attributed to Aquilegia. professi onal. Newsletter Contributions Chapter Presidents Please join us in helpingto encourage interest in Please direct all contributions to the newsletter Boulder ................. Lynn Riedel ............ 666-6687 enjoying and protecting Colorado's native plants. to: Metro-Denver ........ Jeff Dawsop ............ 722-6758 The Society sponsors field trips, workshops and Nina Williams Fort Collins ............ Mike Scott .............. .490-1788 other activities through local chapters and 976 Cherryvale Road Yamparika ............. Reed Kelley .. _......... 878-4666 statewide. Contact the Society, a chapter Boulder, CO 80303 San Juan ................ Gretchen representative, or committee chair for more E-Mail: NCybele@aoLcom Van Reyper .. 835-3268 information. Southwest.. .............. Sandy Friedley ........ 884-9245 Short items such as unusual information about a Schedule. of Mem~ership Fees plant, a little known botanical term, etc. are Committees especially welcome. Camera-ready line art or Life ........................................................ $250 other illustrations are also soJicited. Conservation .......... Janet Coles .............. 44O~0595 and ........... Kathy Carsey .......... 449-3041 Supporting .............. .' ........................... : .. $ 50 Editorial. ............. :.. Nina Williams ......... 499-9858 Organi~ation .......................................... $ 30 Please i-nclude author's name and address, and ........... Tamara Naumann ... 374-2504 Family or Dual ...................................... $ 15 although items will be printed anonymously if and ........... William A. Weber. 492-6171 Individual ............................................... $ 12 requested. Articles submitted on.disks (IBM or Ed!!cation .............. Andrew Kratz ......... 238-6317 Student or Senior .................................. $ 8 Mac) are appre~iated. Please indicate word Fi~d Trips .............. ,Rick Brune .............. 238-5078 processing software and version. and ........... Jeff Dawson ............ 722-6758 Membership RenewallInformation Field Studies .......... Lorraine Yeatts......... 279-3427 HortJRestoration, .... Tina Jones ............... 794-2647 and .......... Ann Armstrong ....... 494-0545 Please direct all membership applicatioI,ls, Legislative Affairs. VACANT .............................. renewals and address changes to the Membership Membership ........... Myrna Steinkamp ... 226~3371 Chairperson, Colorado Native Plant Society, and ........... Sue Martin ............... 226-3371 P.O. Box 200, Fort Collins, CO 80522. Please Publicity ................ VACANT ............................. .. direct all other inquiries regarding the Society to Workshops ............. Bill Jennings ............. 666-8348 the Secretary at the same ~ddress. Number 1 Aquilegia Page 3 Board, continued from page 2 Chair or take some
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