Each spring since 1915 a record of the date of the first appearance of flowers of our seed bearing plants has been kept. This has been handled through a contest with the students in the botany classes. Reports on the comparative dates for some of the more representative species were made in 1918 and in 1924

Dodds, Ellsworth

Jaques, H. E.

English

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 41 Annual Issue Article 17 1934 A Twenty Years Phenological Record of the Spring Flowering Plants of Henry County Ellsworth Dodds Iowa Wesleyan College H. E. Jaques Iowa Wesleyan College Copyright ©1934 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Dodds, Ellsworth and Jaques, H. E. (1934) "A Twenty Years Phenological Record of the Spring Flowering Plants of Henry County," Proceedings of the Iowa Academy of Science, 41(1), 107-108. Available at: https://scholarworks.uni.edu/pias/vol41/iss1/17 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. A TWENTY YEAR'S PHENOLOGICAL RECORD OF THE SPRING FLOWERING PLANTS OF HENRY COUNTY ELLSWORTH DODDS AND H. E. JAQUES Each spring since 1915 a record of the date of the first appear-ance of flowers of our seed bearing plants has been kept. This has been handled through a contest 1 with the students in the botany classes. Reports on the coml?arative dates for some of the more representative species were made in 1918 2 and in 1924.3 The present spring completes twenty such annual lists. Every effort has been made to reduce errors of identification and record to a minimum. The human element, of course, enters into it and flowers may not always be reported on the earliest possible date. Competition among the students is so keen, however, that this would not happen often. It should be born in mind that the dates Table A. Representative Trees l"1t5°1b .. 19 IC> 0 ' 25 2.f:o 2. . ' Felo~ ' ... "."' ,, \ I• I I ,, Acer saccharinum - - - M"'I l!. /v I \ (, ~ /1 I \ /~ ' I~ \ Ulinus americana ~ ·i;?.'~ I \ \ \ u \ '/,,\ // ~1 \ 'I ' MARCH TEMPE.'lATURE - \ -" ,~ l. " ---- v I I \ ., I \ \ "' I ,'I '(/ \ Salix purpurea \ \ ~re. I • .~ I \ ( \ I I \ I \ \ II~ I - '/ I I :", Larix decidua -- v I \ - ++. \I I II -~ '•C / ,, I/ Cercis canadensis •••· )( ~Z; JI\ 10 ,, ' \ a;' ~: ~ I -., .-,o ;\ " APRIL TEMPERATURE - .ar ·) .. ~ t WI. . l \' . .. .L .l < .. ~ ' I\ . ,~ QUercus imbricaria- - -1-;oj ' . _,. " ' " . I .. · 'Y \ v, ~· \ i ;. ,\ ..., .. ir\. Juglans nigra -- 0 'c ~i \. ( I ' i\V. J ~j r /L;' Carys ovata .. ";-/"''\ .. ' ~ lei I'. I I 1 I MAY TEMPERATURE - ,, ..!},-, ..... ( '""' 1 Jaques, H. E. Collecting Contests as a means of increasing student interest in biological subjects. Proc. Ia. Acad. Sci. 38 :267-271. 1931. 2 Jaques, H. E. Some Phenological records of spring flowering plants of Henry county. Proc. Ia. Acad. Sci. 25:413-415. 1918. 3 Jaques, H. E. A ten year's phenological record of the spring flowering plants of Henry county. Proc. Ia. Acad. Sci. 31 :225-227. 1924. 107 1Dodds and Jaques: A Twenty Years Phenological Record of the Spring Flowering PlantsPublished by UNI ScholarWorks, 1934108 IOWA ACADEMY OF SCIENCE [Vor.. XLI represent first fully opened flowers_In most cases a species would not be at its best for bloom until a week or two later. In making this report an attempt has been made to select . the most representative plants. In table A the variation of flowering dates of some of our common trees is shown in graphic form. In Table B. Typical Herbaceous Plants Trillium nivale 'Sallguinaria canadensis MARCH '.l'OO'ERATURE Ranunculus abcrtivus Phlox divaricata z.,,,.. ~ z. ~ "' l'1 I.,,,' , 'J 1 '" ,_ ~ .Al'RIL Tm.IPERATURE z. °(" I 1~1 Aquilegia canadensis Malva rctundifolia Cynogloasum officinale MAY TEMPERATURE iT -, '· I \. I J !'-. " I J \ rj ~ /I ~ i-..· ~ ] .I ~ I. \ ~ h •. i. ·~, I. ,;, ,. 1• ,. Mo ,, :f ! ~-,. / ''· :; I~. ~I '/ 1~ I\ ' ~ ~, - I ~~ ,' j ' I ' , ~ ~ ~. I ..... : ~ \ 11 ,, i /, ....:. \ ~. I ,~ ~ '~ I I \: I ~ ~ J ~J v I \ I ""' \ \ /J ,, ~ ~~ v r\. ~v J , , I ~ /,\ i\ ' } ~ N ' r N '· l.-"' J ~ ~ ~ I ~ v --"' ' L.-· [) ~ / ~ ' ~ '-" LI the same way some common herbaceous plants are graphed in table B. Both tables show average temperature records by months for each year. These' temperature data have been 'furnished by Mr. John Jericho, official weather bureau reporter. Table C shows the reported date of first flowers of a series of representative plants over the period of twenty years. Our full lists are made up for all plants both native and cultivated that live over winter out of doors or are raised from seed in open ground out of doors. In 1934 we had our largest list of 517 different plants reported up to May 28. The average per year runs around 350 species. low A W :ESLEY AN COLLEGE, MT. PLEASANT, lowA. 2Proceedings of the Iowa Academy of Science, Vol. 41 [1934], No. 1, Art. 17https://scholarworks.uni.edu/pias/vol41/iss1/17Table C - Showing Month and Day of First Flowers of Some Representative Species SCIENTIFIC NAME 01' PLANT COMMON NAME AD~~:e/ 1915/i916/ 1917\\191811919/ 1920/i921I1922l 1923l 1924! 1925\l19t26\\ 1927\\ 1928119291193ol 1931\19321193311934 Galanthus Elwesii Hook F. Giant Snowdrop 3-3 3-9 3-11 2-26 3-8 2-22 2-23 2-28 3-13 3-7 3-7 3-6 2-12 2-23 2-29\ 3-14\ 2-18\ 3-13\ 3-25\ 2-22\ 3-7 Acer saccharinum L. White or Silver Maple 3-7 3-9 3-20 3-3 3-8 2-27 3-17 2-16 3-13 3-23 3-14 3-6 3-18 2-28 3-9 3-17 2-22 2-20 2-27 3-3 3-16 Taraxacum officinale Weber. Common Dandelion 3-1 4-7 4-4 3-29 3-19 3-15 4-2 2-15 2-22 3-27 1-31 2-20 1-9 1-28 3-14 2-7 2-25 1-26 1-20 2-24 3-16 Populus tremuloides Michx. American Aspen 3-22 4-6 4-4 3-3 3-18 3-13 3-27 3-15 3-21 4-7 4-3 3-20 3-23 3-12 4-4 3-22 3-8 3-14 4-4 3-16 3-30 Ulmus Americana L. American Elm 3-22 4-6 4-4 3-7 3-18 3-17 3-27 3-7 3-23 4-7 4-7 3-17 3-22 3-12 3-24 3-21 3-10 3-20 4-4 3-18 4-4 Trillium nivale Riddell. Dwarf White Trillium 3-28 4-7 4-4 3-26 3-18 3-31 4-1 3-18 3-25 4-5 3-31 3-24 3-25 3-17 4-4 3-23 3-19 3-31 4-4 3-28 3-28 Hepatica triloba Chaix. Round-leafed Liverwort 3-31 4-11 4-4 3-29 3-19 4-1 4-20 3-14 4-3 4-9 4-7 3-28 4-12 3-18 4-3 3-23 3-11 4-8 4-4 3-16 4-4 Capsella Bursa-pastoris (L) Medic. Shepherd's Purse 3-30 4-7 4-4 4-10 3-18 4-3 4-28 4-5 4-5 3-29 4-5 3-26 4-9 3-23 3-28 3-21 4-2 3-21 4-4 3-3 3-14 Dicentra Culcullaria (L) Bernh. Dutchman's Breeches 4-8 4-12 4-5 4-10 4-1 3-31 4-13 4-4 4-10 4-13 4-14 4-9 4-19 4-4 4-4 4-4 4-4 4-13 4-11 4-8 4-9 Populus deltoides Marsh. Cotton-wood 4-8 4-14 4-18 4-13 4-2 4-7 4-5 3-25 4-7 4-20 4-14 4-3 4-22 4-6 4-4 4-4 4-7 4-13 4-11 4-10 4-11 Acer Negundo L. Box Elder 4-10 4-13 4-14 4-19 4-2 4-7 4-6 3-23 4-5 4-20 4-14 4-1 4-26 4-6 4-10 4-5 4-11 4-13 4-15 4-19 4-16 Sanguinaria canadensis L. Bloodroot 4-4 4-12 4-13 4-16 3-25 3-31 4-13 3-23 4-6 4-11 4-12 4-1 4-14 3-25 4-3 3-26 3-13 4-8 4-6 3-18 4-9 Anemonella thalictroides (L) Spach. Rue Anemone 4-9 4-11 4-15 4-2 4-2 4-7 4-25 4-2 4-10 4-23 4-14 3-30 4-19 4-6 4-4 4-5 4-5 4-10 4-11 4-8 4-10 Claytonia virginiea L. Spring Beauty 4-10 4-15 4-15 4-12 4-2 4-1 4-25 4-4 4-6 4-23 4-14 3-30 4-19 4-19 4-4 4-8 4-7 4-10 4-8 3-28 4-7 N epeta hederacead ( L) Trevisan Ground Ivy 4-11 4-20 4-19 4-20 4-5 4-3 5-10 3-30 4-7 4-21 4-16 4-14 4-28 4-7 4-3 4-5 4-3 4-13 4-7 3-23 4-5 Amelanchier canadensis (L) 4-1914-18 Medic. Service Berry 4-16 4-19 4-18 4-21 4-9 4-11 4-24 4-4 4-10 4-23 4-25 4-10 4-28 4-19 4-24 4-6 4-11 4-21 4-11 Ranunculus abortivus L. Small Flowered B;it-tercup 4-16 4-20 4-19 4-20 4-12 4-7 5-3 4-5 4-13 4-25 4-16 4-14 4-28 4-20 4-4 4-5 4-11 4-17 4-15 4-20 4-17 Erythronium albidum Nutt. Fawn Lily 4-16 4-19 4-18 4-21 4-15 4-11 4-26 4-4 4-13 4-23 4-16 4-12/ 4-21 4-19 4-23 3-27 4-8 4-20 4-18 . 4-12 4-16 Fragaria virginiana Duchesne Virginia Strawberry 4-17 4-17 4-15 4-20 4-10 4-22 4-29 4-5 4-18 4-23 4-25 4-15 4-26 4-8 4-23 4-11 4-10 4-17 5-2 4-12 4-17 Polemonium reptans L. Greek Valerian 4-19 4-23 4-24 4-23 4-11 4-11 4-5 4-18 5-1 4-25 4-12 5-3 4-20 4-26 4-10 4-11 4-17 4-21 4-19 4-18 Phlox divaricata LL. Blue Phlox 4-21 4-23 4-28 4-23 4-10 4-22 5-8 4-5 4-24 4-24 4-24 4-12 5-3 4-22 4-30 4-15 4-11 4-21 4-22 4-19 4-23 Trillium recurvatum Prairie Wake-robin 4-24 4-21 4-24 4-22 4-30 4-20 4-27 4-24 4-26 4-13 5-4 4-20 5-1 4-8 4-26 4-18 4-23 4-10 4-19 Cercis canadensis L. Redbud 4-23 4-22 5-7 4-24 4-22 5-10 4-7 5-1 4-25 4-13 5-3 4-20 5-1 4-8 4-11 4-18 4-23 4-27 4-21 Aesculus glabra Willd. Ohio Buckeye 4-25 5-2 4-30 4-22 5-8 4-20 4-27 5-2 4-25 4-17 5-3 4-19 5-7 4-12 4-17 4-18 4-28 4-28 4-23 Arisaema triphyllum (L) 4_'29 Schott. Jack-in-the-Pulpit 4-27 4-26 5-12 4-28 5-2 4-29 5-7 4-28 4-19 5-12 5-2 5-10 5-20 5-25 5-10 5-1 4-30 Aguilegia canadensis L. Wild Columbine 4-28 5-11 5-14 4-24 5-9 4-22 5-2 5-5 5-2 4-18 5-7 5-3 5-14 4-29 5-1 5-5 5-5 5-1 5-2 Berberis vulgaris L. European Barberry 4-28 5-16 5-7 5-9 5-20 5-16 5-21 5·-10 5-13 5-11 5-24 5-4 - - 5-9 5-13 5-7 Potentilla canadensis L. Five Finger 5-4 5-15 5-19 5-5 5-18 5-2 5-3 5-21 5-5 4-23 5-13 5-11 5-17 5-13 5-8 5-14 5-9 5-15 5-7 Malva rotundifolia L. Common Mallow 5-5 5-15 5-20 5-18 5-8 5-9 5-3 5-13 5-4 5-28 5-9 5-16 4-29 5-7 5-19 5-10 5-4 4-30 Asparagus officinalis L. Garden Asparagus 4-30 5-15 5-20 5-29 5-26 5-10 5-8 5-16 4-30 4-23 5-14 5-16 5-17 5-11 5-13 5-18 5-18 5-15 5-3 Tri foli um repens L. White Oover 5-12 5-15 5-23 5-16 5-26 5-9 5-9 5-26 5-7 4-23 5-14 5-13 5-17 4-30 5-9 5-25 5-9 5-8 5-8 Hydrophyllum virginianum L. Virginia Waterleaf 5-10 5-18 5-29 5-23 5-12 5-13 5-25 5-20 5-8 5-17 5-17 5-28 5-17 - - 5-20 5-15 5-11 Cynoglossum officinale L. Common Hound's Tongue 5-6 5-19 5-28 5-23 5-20 5-16 5-25 5-13 . 5-15 5-14 5-16 5-22 5-13 5-27 5-21 5-19 5-15 5-11 Vitis vulpina L. Frost Grape 5-12 5-29 5-20 6-2 5-30 5-24 5-13 5-2 5-20 5-4 5-19 5-21 5-22 5-25 5-13 5-27 5-19 5-23 5-11 Me!ilotus officinalis (L) Lam. Yellow Sweet Clover 5-17 5-26 5-29 5-11 5-19 5-31 5-26 5-13 5-20 5-21 5-17 5-27 5-26 - 5-24 5-19 5-8 Robinia Pseudo-Acacia L. Common Locust 5-6 5-27 5-27 5-30 5-16 5-25 5-23 5-16 5-22 - - 5-20 5-13 5-25 5-20 5-23 5-11 3Dodds and Jaques: A Twenty Years Phenological Record of the Spring Flowering PlantsPublished by UNI ScholarWorks, 1934

A Twenty Years Phenological Record of the Spring Flowering Plants of Henry County

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A Twenty Years Phenological Record of the Spring Flowering Plants of Henry County

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