Y Schmidt, Diane (2002). Using the biological literature : a practical guide. Books in library and information science ; 60 (3rd rev. and expanded ed.). Marcel Dekker. ISBN0-82470-667-6. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
My starting point
Y Carter, David J. (1999). Care and conservation of natural history collections. Butterworth-Heinemann series in conservation and museology. Boston: Butterworth-Heinemann. ISBN0-7506-0961-3. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (LSH, QH 61 C37 1999)
Y Jaeger, Edmund (1955). A source-book of biological names and terms (3rd ed.). Springfield, Illinois: Thomas. (LSH QH 13 J22s 1955; Botanique, REF QH 83 J34 1955)
Go-to reference.
Y Bell, Adrian D. (2008). Plant form : an illustrated guide to flowering plant morphology. Illustrated by Alan Bryan (New ed.). Portland, Oregon: Timber Press. ISBN9780881928501. (EPC, Botanique, QK 641 B446 2008 )
Could be more complete
N Baumgardt, John Philip (1982). How to identify flowering plant families : a practical guide for horticulturists and plant lovers. Portland, Oregon: Timber Press. ISBN0917304217. (EPC, QK 495 A1 B38 1982)
Too terse
N Dingley, Michael (1985). Biological museum methods, Volume 2: Plants, invertebrates and techniques. Orlande: Academic Press. ISBN0-12-323302-X. (EPC, LSH, QH 61 H36 1985)
Dated
Y Winston, Judith E. (1999). Describing species : practical taxonomic procedure for biologists. New York: Columbia University Press. ISBN0-23-106824-7. (EPC, QH 83 W56 1999)
AKA "Species for Dummies", leaves to be desired in for botany, though.
Wyatt, Harold Vivian (1997). Information sources in the life sciences. Guides to information sources (4th ed.). London: Bowker-Saur. ISBN1-85739-070-9. (EPC, REF Z 5320 B68 1997)
Y Stearn, William T. (1973). Botanical Latin : history, grammar, syntax, terminology and vocabulary (2nd. ann. and rev. ed.). Newton Abbot: David & Charles. ISBN0715385488. (EPC, REF QK 10 S74 1973)
A must, excellent with roots.
Schmidt, Diane; et al. (2005). Guide to Reference and Information Sources in Plant Biology (3rd ed.). Westport: Libraries Unlimited. ISBN978-1-56308-968-8. {{cite book}}: Explicit use of et al. in: |author= (help) (Botanique, REF Z 5351 G85 2006)
Reed., Clyde F. (1971). Common weeds of the United State. New York: Dover Publications. ISBN0486205045. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (Botanique, SB 612 A2 E83 1971)
Blake, Sydney Fay (1974) [1942]. Geographical guide to floras of the world, part 1: Africa, Australia, North America, and Islands of the Atlantic, Pacific, and Indian Oceans. Revised by D. G. Frodin. Königstein: Otto Koeltz Science. ISBN3874290603. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (Botanique, Z 5358 A12 B52 1974)
Frodin, David G. (2001). Guide to standard floras of the world : an annotated, geographically arranged systematic bibliography of the principal floras, enumerations, checklists, and chorological atlases of different areas (2nd ed.). New York: Cambridge University Press. ISBN0521790778. (Botanique, REF Z 5351 F76 2001)
Brummit, R. K. (1992). Vascular plant families and genera. Kew: Royal Botanic Gardens, Kew. ISBN0947643435. (Botanique, REF QK 97 B78 1992)
James G., Harris (2001). Plant identification terminology : an illustrated glossary (2nd ed.). Spring Lake, Utah: Spring Lake Publishing. ISBN0964022168. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (Botanique, REF QK 9 H37 2001)
Harrington, Harold David (?1957). How to identify plants. Athens, Ohio: Swallow Press. ISBN0804001499. {{cite book}}: Check date values in: |year= (help) (Amén., QK 51 H37 1957)
Jeffrey, Charles (1982). An introduction to plant taxonomy (2nd ed.). Cambridge: Cambridge University Press. ISBN0521287758. (Botanique, QK 93 J43 1982)
Sivarajan, V.V. (1991). Introduction to the principles of plant taxonomy. Edited by N.K.P. Robson (2nd ed.). Cambridge: Cambridge University Press. ISBN0521355877. (Botanique, QK 95 S58 1991)
Zomlefer, Wendy B. (1994). Guide to flowering plant families. Chapel Hill: University of North Carolina Press. ISBN0807844705. (Botanique, QK 115 Z65 1994)
Heywood, Vernon H. (ed.) (2007). Flowering plant families of the world. Revised and updated edition of Flowering plants of the world (3rd ed.). Buffalo: Firefly Books. ISBN9781554072064. {{cite book}}: |first= has generic name (help) (Botanique, REF QK 495 A1 F56 2007)
Forman, Leonard (1989). The Herbarium handbook. Kew: Royal Botanic Gardens, Kew. ISBN0947643206. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (Botanique, QK 78 H47 1989 )
Harborne, Jeffrey B. (1993). Phytochemical dictionary : a handbook of bioactive compounds from plants. New York: Taylor & Francis. ISBN0850667364. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) (Santé, Botanique, RefPharm/REF QK 898 B54 P459 1993)
Womersley, J.S. (1981). Plant collecting and herbarium development : a manual. FAO Plant Production and Protection Papers. Vol. 33. Rome: Food and Agriculture Organization of the United Nations. ISBN9251011443. (Botanique, QK 75 W65 1981 )
Kent, Douglas H. (1967). Index to botanical monographs : a guide to monographs and taxonomic papers relating to phanerogams and vascular cryptogams found growing wild in the British Isles. New York: Academic Press. (Botanique, Z 5358 G7 K46)
Schmidt, Diane (2002). Using the biological literature : a practical guide. Books in library and information science ; 60 (3rd rev. and expanded ed.). Marcel Dekker. ISBN 0-82470-667-6. 
Baumgardt, John Philip (1982). How to identify flowering plant families : a practical guide for horticulturists and plant lovers. Portland, Oregon: Timber Press. ISBN 0917304217. (EPC, QK 495 A1 B38 1982)
