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15. genus is that by Weda (1966), who reported 2n = 46 chromosomes, a number indicating, if exact, the basic number x = 23. It also ought to be mentioned here that we feel there are sufficiently strong morphological and palynological indications that the section Stenophora of Gentians would be most adequately accommodated under the genus Tripterispermum, although cytological evidence is missing. The genus Megacodon H. Sm. of Smith (1936) includes two Himalayan species the cytology of which remains unknown. Toyokuni (1965a) argued that this taxon would be better placed as a subgenus of Gentiana, close to its typic …

10. Graminaceae. 115. Crassulaceae. 116. Euphorbiaceae. 117. Saxifragaceae. 118. Pittosporaceae. 119. Brunelliaceae. 120. Campanulaceae. 121. Nyctaginaceae. 122. Bromeliaceae. 123. Hamamelidaceae. 124. Platanaceae. 125. Crocifloraceae. 126. Rosaceae. 127. Connaraceae. 128. Leguminosae. 129. Geraniaceae. 130. Oxalidaceae. 131. Tropaeolaceae. 132. Linaceae. 133. Humiriaceae. 134. Erythroxylaceae. 135. Zygophyllaceae. 136. Cneoraceae. 137. Rutaceae. 138. Simaroubaceae. 139. Burseraceae. 140. Meliaceae. 141. Malpighiaceae. 142. Trigoniaceae. 143. Vochysiaceae. 144. Tremandraceae. 145. Polygalaceae. 146. Dichapetalace …

connectors between the groups (more than one pair with the same similarity value in different groups). As noted before, we modified or restricted the selection of nodal cultivars to those cultivars that were classified at the early levels (higher c-values or similarity ratios). Logically, any of the cultivars that satisfied the criterion for being a node, regardless of the level or amount of similarity, could have been selected. The hierarchical arrangement could have been continued and groups based on nodal cultivars with lower c-values could have been designated as subgroups. However, since the understanding of …

… ny kinds of detailed studies over a long period of years. One of these involved comparison among the species of this unique collection growing under uniform conditions, of form and structure of the various plant parts. Another involved determination of the number and character of the chromosomes of each species. A leading clue was the analysis of chromosome behavior in over 200 hybrids between species. Finally, the evidence from the geographic distribution of species was considered. Based upon studies of the geologic history of the Americas, Antarctica and Australasia, migration paths in the distant past are show …

… This phenomenon is common in grasses, Solus, Crataegus, Composites & Legumes. Elymus (Gramineae) is example at Grays Summit. Blue-grass - not always a polynio, but mostly so. Chromosome complements mostly from 56-70; the range being from 28-90. All seem interfertile. Cross pollinacy any of these + F1 will always look like the mother plant, since stimulus from a foreign plant, but if self-pollinated, mostly get a peculiar looking offspring. This type of thing in higher plants allows the reproduction of individuals which are constant, but which will (by use of the sexual plants) produce plants if conditions change.

page 15 (Student) Are you suggesting that the basic problem so far in taxonomy is that it is primarily qualitative in nature and not quantitative. That is you say a plant is pubescence, and when you are going through your key you can find the word pubescence but it doesn't really give you any indications in a quanti- tative sense as to what pubescence means with respect to the specimen you got have/. Is that what you are saying? (Dave) That's right. We could take, for the purposes of classification, I always keep these sorts of things;in mind, that this, make this statement before you say anything else. For the p …

Provisional, not fully developed, CLASSIFICATION OF DESCRIPTOR TYPES IN CRO WORK 1. "Finding information" Accession information accession numbers accession dates accession types Collection information names of collectors collector's numbers collection dates Nomenclature information scientific names common names nymaric designations of individuals Origin country of origin state or province precise locality latitude/longitude donor of accession Storage information physical location of accession in store conditions of storage bag, envelope, box, can, etc. storage temperature, etc. 2. Organismic information Biochemic …

Sato RR (1935) p2 While many animals, polyploids is no widespread in flowering plants than genera that don't show a clear one case gir myolimn tezgands is an exception. The evolution of many plant genera has clearly been accompanied by the development of high chromosome multiples for an original basic number. p3 In 1922 Blechele described haploidy in Datura i.e. the egg cell develops patrogonet. Dendracee. plain having single 2n7 chromosomes. Such plants are usually much dwarfed, but is significant than in the majority of the triploids (Zan fye) Chromosomal maps / Drosophile

… g him a note of correction. I'll work something out. We picked up an interesting Bouteloua in western Texas on our trip last week. From the few herbarium specimens we had seen and the general nature of the plant I had assumed that this would be the fourth in a series of diploids in the Bouteloua curtipendula complex. BUT examination of pollen meiosis divisions show the type specimen plant to have 2n=25. This is five chromosomes over the diploid count and is different from any situation that I have yet encountered in the B. cu. complex studies. I do have a B. filliformis strain from Mexico with a 2n=21 chromosome …

… been analyzed as to their meiosis. No other tribe or group of comparable size has been so intensely studied. Here I would like to make a brief methodological deviation before continuing a discussion of the classification of these genera, which since Linnaeus have been periodically lumped into a few or split into numerous genera on various considerations. The method of approach to a scientific problem of this kind is clearly of extreme importance, as is the philosophical thinking behind the conclusions to be drawn, because they will to a large extent determine the type of discovery made or the clarification forego …

No. Plants (1) Florists ghent X 39037 Mrs. Carmichael x Alice 126 (2) " " X 39030 V.F. x Maxwellli 192 (3) " " X 39085 Fielders White x Kaempferi 528 (4) " " X 39086 Multiflora x Kaempferi 144 (5) " " X 35287 Multiflora x Maxwellli 162 (6) 27445 V.F. x Miyagimo X 32414 Malvatica x Satsuki 288 (7) 32222 Hinodegiri x Willy X 27445 V.F. x Miyagimo 240 (8) 131312 Shinnyo-no-tsuki X 39454 A. mac. x 131320 Tama-sugata 336 (9) 127674 A. ind. mac. var. Jindai X 39454 A. mac. x 131320 Tama-sugata 288 (10) 127672 A. ind. mac. var. How-raku X 39454 A. mac. X 131320 Tama-sugata 384 39720 - 161483 Rhododendron Simsii 48 39735 …

… low stability were discarded. Two broad groups of the entities may be recognized. For present purposes, these are designated "convariants" in accord with proposals for an international code for cultivated plants. "Convariant" is used at the same level of classification of cul- tivated plants as "subspecies" is used for wild ones. It does not carry any suggestion of geographic separation, for obvious reasons, as does subspecies for native populations. The characteristics which differentiate the two convariants are: Group A: silver-colored stem, and light tan, smooth- surfaced roots. Group B: brown to yellow stems …

… s work is being done by aid of the modern retrieval methods of Dr. David J. Rogers of the Taximetrics Laboratory of the Department of Biology, in connection with the creation of a complete data bank on all plant chromosome numbers published. The arctic list certainly will be useful as a manual for other cytotaxonomists and phytogeographers, at the same time as it will be a gold mine for those who want to study various aspects of chromosome numbers and polyploidy and their connections with various phytogeographical phenomena. No checklist has ever been made of the strictly alpine plants of the mountains in the bor …

… quier gran Instituto de Botánica en el extranjero, rogando que el taxonómista respectivo nos suministre los nombres. Pero ningún Instituto, lo mejor dotado, lo puede hacer. Durante cientos de años se traía plantas del extranjero de todos los continentes. Se puede averiguar donde vive un especialista-taxónomo respectivo; pero como una familia a veces se divide en mil géneros diferentes y en muchos miles de especies cada género, hay que ver si actualmente vive alguien quien estudie dicho grupo. Puede ser que no exista un taxonómista competente para las especies -por ejemplo- del África o del Asia Oriental de donde …

3. Perhaps the greatest contribution to botany made by Dr. Bessey was his phylogenetic system of taxonomy, and his last work, "The Phylogenetic Taxonomy of Flowering Plants", was one of a series of papers read by invitation at the 25th Anniversary Celebration the Missouri Botanical Garden, October 15, 1914. Dr. Bessey died in Lincoln, Nebraska on February 25, 1915. The Besseyan system is quite a departure from the systems we've seen up to this report. The closest parallel is to that of Engler, but the most primitive group is the Ranales, rather than the Apetalous forms, which according to Bessey, are but reductio …

… define the problem, determine what is of particular interest about the problem, and to check ones premises in regard to the discipline or disciplines involved. The problem herein referred to was a group of plants collected by my professor in Taximetrics, purported to be representatives of the Family leguminosae, Genus Astragalus. So it seemed they were. My objective was to be a classification of a number of these plants by the taximetical method I was to learn in class. Basically, the plants interested me because the genus contains species that are poisonous range forage plants quite unhealthy for cattle, and are …

classe 15. cryptogamies... Les plantes qui sont comprises dans cette classe n'ont point de fleurs vraiment distinctes. Dans quelques-unes la fruitification est comme celle, ou tout à fait inapparente (les champignons sans l'autre) on observe des parties qui paraissent réellement minéralisées (les mousses). Mais la nature et le véritable usage de ces parties ne sont malgré cela que supposés. Ces plantes sont très nombreuses, et les caractères qui doivent servir à les déterminer, ou cachés en général sous des nuances et délicates, que la distinction des genres, et sur tous les espèces qui les composent, est très di …

… s rather uniform in its gross morphological characteristics, such differentiation on the part of primitive ethnobotanists will be of considerable interest to the anthropologist interested in perception and classification of the natural world. The basic taxonomic structure of the Aguaruna plant world appears to conform in many respects to plant taxonomies found in primitive societies elsewhere in the world and provides further evidence on the nature of pre-scientific systems of classification (Berlin, Breedlove and Raven 1966, 1968, in preparation; Berlin n.d., 1969, 1970; Conklin 1954). There is, for example, no …

Taxonomy—mainly classification.) at first glance, it would seem that, whatever knowledge of the genetic basis of variation, chromosome structure and behavior would seem to be of greatest significance, it would seem to me to be most unscientific to rely on that type of evidence to the complete, or even partial exclusion, of other evidence. I think, when we know enough, we will see that genetic differences are accompanied by differences in morphology, physiology, and adaptation to environment. Where at present, these differences seem to be absent, I think the discrepancy can be traced to the incompleteness of our k …

… we keep that in the back of our minds and we can perhaps whether justifiably or unjustifiably infer that maybe the others are the same. (Student) I think to go out on a limb and say that seeds tell me that plant distribution is valid as a key to the identification plant. (Henry) It is, but we are not talking about identi- fication, we are talking about classification now. And it is real handy to know that a certain group of plants only exist in Australia. It limits our searching. We can use that definitely in a key for identification. (Student) But doesn't this fact that they are located only in one place imply t …