摘要:

The leaf blade anatomy of all species ofNeurachne, ParaneurachneandThyridolepishas been examined, with special reference to features reliably indicative of photosynthetic pathway.Neurachne alopecuroidea, N. queenslandicaandN. tenuifoliaexhibit C3anatomy, as do all threeThyridolepisspecies.Paraneurachne muelleri, N. munroiandN. minorall have C4anatomy, of the rare ‘Alloteropsis‐type’.However, all the species exhibit unusual anatomical features, andN. lanigeracannot be confidently assigned as C3or C, on anatomical grounds alone. Taxonomic considerations confirm that the three genera are closely related to one another in the context of the eu‐panicoid assemblage as a whole, and that the genusNeurachneitself, although it exhibits variation in photosynthetic pathway, is not amenable to further taxonomic subd

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00364.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

A developmental study of the cuticle has shown that it consists of a homogeneous cuticle proper apposed on the wall and a heterogeneous cuticular layer generated by intussusception of cutin into the wall. At an early stage, the adcrusted cuticle proper is underlain by a ruthenium red‐positive layer in which the cuticular layer originates. The origin of the anticlinal flange is referable to an electron‐dense, ruthenium red‐positive ridge which arises above the anticlinal wall and which also becomes cutinized. At leaf maturity, the inner surface of the cuticular layer, including that of the flange, forms interdigitating protuberances with the cell wall.Development of the cuticle coincides with deposition of crystals of calcium oxalate in the epidermal cell wall. Initiation of large, early‐formed crystals is associated with electron‐opaque membranous structures formed close and parallel to the plasmalemma in the young cell wall. Crystals undergo periclinal and anticlinal growth and subsequently become engulfed within the cuticle by development of the cuticular layer. Cutin/polysaccharide interaction during development and the significance of crystal deposition are

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00365.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Stipular development inCaesalpiniadisplays two patterns. More commonly, stipules, throughout the development of the leaf, assume a subordinate position never keeping pace with the petiole‐blade portion. In two out of eight species the stipules showed strong proleptic development exceeding in size their own leaf within a plastochron of initiation and soon thereafter covering that leaf. Information on stipule development, as well as other features of the embryonic leaf may be of use to the taxonomist and such data can now be obtained relatively easily using SE

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00366.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Australian acacias introduced to the Cape about 145 years ago are replacing indigenous vegetation over extensive lowland areas. This paper describes their growth, litter‐fall, reproductive and nectar secretion phenology. Results indicate that growth and litter‐fall are seasonal events, but timing varies with species and site. However, reproductive phenology is characteristic of a species, and varies little with time and place. Nectar secretion appears to be associated with both growth and flowering. Comments are made on the use of these phenological data in distribution mapping, control and utilizat

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00367.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The taxonomic history of plants known under the name ‘coca’ is complex. During the period 1860–1910, botanists, horticulturalists and pharmacists became increasingly interested in the varieties of coca then known in cultivation. A debate over the correct identity of the cultivated cocas ensued which continues today. During the latter part of the 19th century and early part of the 20th century, several new taxa were described from cultivation which significantly ‐complicated the taxonomy. Notable contributors were D. Morris in Kew, W. Burck in Bogor, H. H. Rusby in New York and O. E. Schulz in Berlin. In order to evaluate the complex interaction among these workers, it is necessary to examine the problem chronologically. Two cultivated species of commercial coca are now recognized:Erythroxylutn cocaLam. andErythroxylutn nooogranatense(Morris) Hieron., each of which has one distinct variety in cultivation:E. cocavar.ipaduPlowman andE. novogranatensevar.truxillense(Rusby) Plowman, respe

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00368.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

A critical comparison of many characters suggests that the Rubiaceae tribe Anthospermeae is closely allied to the tribe Paederieae. The delimitation of the tribe Anthospermeae from other tribes is redefined as to include only wind‐pollinated genera, and characters of fruit structure, pollination biology and distribution patterns support the subdivision of the tribe into the three subtribes: Anthosperminae, Operculariinae and Coprosminae.All insect‐pollinated genera previously placed in the Anthospermeae are transferred to the Paederieae. It is shown that the genusNeogailloniaLinchevskii (= GailloniaA. Rich. ex. DC), previously included in the Spermacoceae, also belongs to this tribe; the generaPterogailloniaLinchevskii,PseudogailloniaLinchevskii,JaubertiaGuill. andChoulettiaPomel are considered synonyms ofNeogaillonia.The Anthospermeae are believed to be closely, and the Paederieae more remotely, allied to the tribe Theligon

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1982.tb00369.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY