Prize-winning crossword

When all the answers are in place, the letters in the odd-numbered squares from 1 to 23 will spell out the title of a 1978 book by a famous late plantswoman. Her name is spelled out by the first two letters of the answers to 29, 31, 32, 34 and 35 across. ACROSS 1 Tie up an animal (6) 5 Give tangible form to 6) 9 ___ willowherb, tall, pinkflowered plant (7) 11 Colour of a flower described as ‘flavidus’ (6) 12 Adonis annua, the Pheasant’s ___ (3) 13 Upper part of the River Cam (6) 16 Plant seeds (3) 17 Tear (3) 18 Roy Orbison Top 10 hit of 1963 (2,6) 22 Girl’s name (8) 23 Woman in holy orders (3) 24 and 29 Variety of Hydrangea

paniculata (3,3) 26 Ice cream dessert (6) 29 See 24 across 31 Close-packed crowd (6) 32 Prince of Wales (7) 34 Be present at (6) 35 Reinforced front of a shoe (6) DOWN 2 Rhododendron Miss Lee (5) 3 Centre of a wheel (3) 4 Beam of sunlight (3) 5 African country (5) 6 Lemon ___, bushy herb of the mint family (4) 7 Castle ___, National Trust property in Devon (5) 8 Fragrant South African plant (7) 10 Atmosphere, or tune (3) 13 Leaf vegetables (6) 14 Limbs, or weapons (4) 15 Covered walk with shops (6) 16 Spade’s-depth layer of earth (4) 19 Animal manure (4) 20 Loose, granular substance (4) 21 The Importance of Being ___, (7) 25 ___ the Sheriff, hit for Eric Clapton (1,4) 27 Recommended strongly (5) 28 Tree of the Fraxinus genus (3) 29 Lightweight wood used in model-making (5) 30 ‘___-in-a-mist’ (4) 32 Domesticated feline (3) 33 Wood-chopping tool (3)