摘要:

Ten stands ofRubus nessensis, an apomictic blackberry, were studied. Perennial stools produce biennial shoots that flower in their second year. The stools tend to produce shoots of similar height for several consecutive years. Flowering, but not relative fruit set, is dependent on shoot height. Shoot height and density appear to be positively related, implying that intraspecific competition is of little importance for plant vigour. Depletion time varies greatly between stands (4–29 years), being comparatively longer in stands with short shoots. New establishment is sparse and takes place mostly by root suckerin

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00955.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Five stands of an apomictic blackberry,Rubus nessensis, were studied. Biennial shoots flower and fruit in their second year on lateral branches developed from axillary buds. Most premature death of reproductive units occurs by withering of entire laterals, presumably due to damage by frost during the preceeding autumn or winter. Health status of the floricane, assessed as percentage live axillary buds in the spring, was positively correlated with the reproduction parameters. Shoot height as well, is positively correlated with number of flower buds and flowers produced on each lateral but, however, negatively correlated with number of berries, probably because tall shoots tend to suffer more damage by frost which seriously afflicts the vascular tissues of the laterals.The position of the axillary buds on the shoot affects survival and degree of fertility, those situated medially greatly surpassing apical and basal ones.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00956.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00957.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

ThePinus mugocomplex is revised, and a new infraspecific classification of the species is proposed. The species is divided into two subspecies and an intermediate nothossp., viz. ssp.mugo, ssp.uncinataand nothossp.rotundata. P. mugossp.mugois divided into f.mugoand f.applanatacomb, et stat. nov. (P. pumilio) andP. mugonothossp.rotundataintof. rotundataandf, mughioidescomb. nov. The putative hybridP. mugo × sylvestrisfound in mixed stands of the parents is namedP. × rhaetica. A description ofP. sylvestrisand a key toP. mugo, P. sylvestrisandP. × rhaeticais giv

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00958.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Cheirostylis seidenfadenianais described from Kerala in India. The new species appears to be related toC. parvifoliaand shares some characteristics withC. thailandicaandC. montana, but differs in floral characters.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00959.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00960.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Five species ofEhretiain eastern Africa are shown to be better placed in the currently entirely American genusBourreria. The new speciesB. lyciaceafrom S Somalia and E Kenya is described and illustrated. New combinations areB. petiolaris, B. nemoralis, B. orbicularisandB. teitensis.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00961.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

The correct name of the species currently calledCampanula canescensorC. benthamiiin Asian floristic literature is shown to beC. dimorphantha. The distribution of the species is mapped and its occurrence in both Africa and Asia is confirmed. Both cleistogamous and normal flowers may be produced in plants ofC. dimorphantha. The adaptive significance of this dimorphism is briefly discussed.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00962.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Three new species,Boesenbergia acuminata, B. basispicataandB. petiolataare described and illustrated.Boesenbergia siamensiscomb, nov. is illustrated. A key to the species in Thailand is also presented.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00963.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

The floral development of 47 epidendroid and vandoid orchids was studied by means of scanning electron microscopy, paying special attention to the early development of the gynostemium (column) and its appendages. The following main conclusions are drawn: the lateral appendages of the adult gynostemium are homologous with the two lateral stamens of the inner whorl; their primordia are present even in species which lack prominent appendages in the adult gynostemium (incorporation of the sta‐minodial primordia into the gynostemium during development). Ventral appendages observed in some species are supposed to be vestiges of the adaxial stamens on account of their early initiation. It is confirmed that the rostellum is the upper part of the median stigma lobe and that the lip corresponds to the inner median tepal. The affinities of the epidendroid and vandoid orchids are briefly discusse

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00964.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY