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CAMPANULA SCABRELLA ENGELMANN (CAMPANULACEAE)HECKARD LR.1980; MADRONO; ISSN 0024-9637; USA; DA. 1980; VOL. 27; NO 4; PP. 179-180Article

A TAXONOMIC RE-INTERPRETATION OF THE OROBANCHE CALIFORNICA COMPLEXHECKARD LR.1973; MADRONO; U.S.A.; DA. 1973; VOL. 22; NO 2; PP. 41-70; BIBL. 14 REF.Serial Issue

TAXONOMY AND DISTRIBUTION OF OROBANCHE VALIDA (OROBANCHACEAE)HECKARD LR; COLLINS LT.1982; MADRONO; ISSN 0024-9637; USA; DA. 1982; VOL. 29; NO 2; PP. 95-100; BIBL. 4 REF.Article

TAXONOMIC STATUS OF CORDYLANTHUS (SUBG. DICRANOSTEGIA) ORCUTTIANUS (SCROPHULARIACEAE) = POSITION TAXONOMIQUE DE C. (SUBG. D.) O. (S.)CHUANG TI; HECKARD LR.1975; MADRONO; U.S.A.; DA. 1975; VOL. 23; NO 2; PP. 88-95; BIBL. 9REF.Article

NEW DISTRIBUTIONAL RECORDS FOR CALIFORNIA FLOWERING PLANTS OF AQUATIC AND MOIST HABITATS.RUBTZOFF P; HECKARD LR.1975; WASSMANN J. BIOL.; U.S.A.; DA. 1975; VOL. 33; NO 1-2; PP. 89-106; BIBL. 3 P. 1/2Article

A NEW LEWISIA (PORTULACACEAE) FROM THE SIERRA NEVADA OF CALIFORNIAHECKARD LR; STEBBINS GL.1974; BRITTONIA; U.S.A.; DA. 1974; VOL. 26; NO 3; PP. 305-308; BIBL. 6REF.Article

CHROMOSOME NUMBERS OF ORTHOCARPUS AND RELATED MONOTYPIC GENERA (SCROPHULARIACEAE: SUBTRIBE CASTILLEJINAE)TSAN IANG CHUANG; HECKARD LR.1982; BRITTONIA; ISSN 0007-196X; USA; DA. 1982; VOL. 34; NO 1; PP. 89-101; BIBL. 19 REF.Article

MORPHOLOGY, EVOLUTION, AND TAXONOMIC SIGNIFICANCE OF THE INFLORESCENCE IN CORDYLANTHUS (SCROPHULARIACEAE) = MORPHOLOGIE, EVOLUTION ET IMPORTANCE TAXONOMIQUE DES INFLORESCENCES DE C. (S.)TSAN IANG CHUANG; HECKARD LR.1976; AMER. J. BOT.; U.S.A.; DA. 1976; VOL. 63; NO 3; PP. 272-282; BIBL. 13REF.Article

ULTRASTRUCTURAL STUDIES OF THE POLLEN OF SUBTRIBE CASTILLEIINAE, FAMILY SCROPHULARIACEAE = ETUDE DE L'ULTRASTRUCTURE DU POLLEN DE LA SOUS-TRIBU DES C., FAMILLE DES S.JENSEN WA; ASHTON M; HECKARD LR et al.1974; BOT. GAZ.; U.S.A.; DA. 1974; VOL. 135; NO 3; PP. 210-218; BIBL. 15REF.Article

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