1. The Monocots: Part 1 Overview, Basal, and “Petaloid” Groups Spring 2010

2. Figure 9.1 from the text

3. Synapomorphies of Monocots Root system adventitious One cotyledon Stems with scattered vascular bundles (no secondary growth); herbaceous Leaves parallel-veined with a sheathing base Flowers pentacyclic (5 whorls), trimerous Sieve cell plastids with several cuneate protein crystals Lots of molecular support for monophyly

4. Additional features of monocots Leaves formed from the basal end of the leaf primordium Usually with monosulcate pollen Lack glandular teeth on leaves

5. Monocot characters One cotyledon! MONOCOT NON-MONOCOT

6. Monocot characters Leaves: –parallel venation in most monocots [may be reversals with net-venation!] –sheathing base Trillium Smilax

7. Monocot characters Cuneate protein bodies in sieve cell plastids –“wedge-shaped” inclusions –function unknown

8. Monocot characters Adventitious roots: -derived from structures other than another root

9. Monocot characters Scattered vascular bundles in stem –numerous; actually complex organization –no vascular cambium (a few weird exceptions)

10. Monocot characters Pentacyclic, trimerous flowers with 2 perianth whorls

11. How many monocots? ca. 3,000 genera ca. 65,000 species 22-25% of angiosperms Include: -aroids -bananas -lilies -gingers -orchids (20,000+ spp.) -irises -palms -grasses (10,000 spp.)

12. Phylogeny of Monocot Groups Acorales Alismatales Asparagales Liliales Dioscoreales Pandanales Arecales Poales Commelinales Zingiberales Basal “Petaloid” Commelinoid

13. Basal and “Petaloid” Monocot Groups Order Acorales Acoraceae Order Alismatales Araceae Alismataceae Order Liliales Liliaceae Order Asparagales Agavaceae Alliaceae Amaryllidacaee Iridaceae Orchidaceae

14. Basal Monocots: Acorales: Acoraceae Widespread, temperate throughout tropical regions Aquatic herb Diversity: 1-3 spp. in 1 genus (Acorus) Flowers: typical of Araceae, coalesced into a spike-like spadix Significant features: Sister to the rest of the monocots; contain ethereal oils. Special uses: (none) Required taxa: (none, but Acorus evolutionarily important)

15. Acorus (sweet flag)– The most basal monocot! Aquatic.

16. “Petaloid” Monocots—Alismatales: Araceae (The Arum Family) Cosmopolitan; greatest diversity in tropical regions Terrestrial and aquatic herbs, vines, epiphytes, floating aquatics Diversity: 2,830 species, 109 genera Flowers: many, small; lacking extensive perianth, carpels 2-3; spatially separated in inflorescence or sometimes plants dioecious Significant features: inflorescence – spadix subtended by a spathe Special uses: many ornamentals; Colocasia as food Required taxa: *Arisaema, Lemna * Change from lab manual!

17. Araceae—Arisaema Arisaema triphyllum Jack-in-the-pulpit Arisaema dracontium green dragon -spathe overlapping below, mostly arched above, striped or marked -spadix usually slender and elongate -flowers unisexual and only at the base of the spadix Arisaema sikokianum

18. Araceae Monstera Philodendron

19. Amorphophallus

20. Araceae: Lemna and friends Lemna ~ duckweed Reduced plant body: no stem or leaves; sometimes no roots Rarely flower

21. Alismatales: Araceae Economic plants and products: Colocasia esculenta Taro “root” or dasheen “poi” 10% of the world uses as staple (starch) in diet

22. “Petaloid” Monocots—Alismatales: Alismataceae (The Water Plantain Family) Widely distributed Aquatic & wetland rhizomatous herbs Number of species: 80 species, 11 genera Flowers: sepals & petals distinct, many apocarpous carpels Significant features: rhizomatous Special uses: ornamental aquatics Required taxa: Sagittaria

23. Liliales: Liliaceae in the broad sense …are a garbage can taxon.

24. Plus many members of Asparagales… Figure 9.14 from the text

25. “Petaloid” Monocots—Liliales: Liliaceae (The Lily Family) Widely distributed in temperate regions of the Northern Hemisphere Herbs, usually with bulbs or contractile roots Number of species: ca. 600 species, in 16 genera Flowers: tepals 6, distinct, carpels 3, stamens 6 Significant features: Fruit a loculicidal capsule, sometimes a berry Special uses: many ornamentals Required taxa: Erythronium, Tulipa

26. Liliaceae - Lilium

27. Liliaceae Erythronium trout-lily

28. Liliaceae Economic plants and products (horticultural): Lilium Easter lily Tulipa tulip

29. Asparagales vs. Liliales Herbs; not succulent Tepals often spotted Nectaries at base of tepals/filaments Styles 1 (trifid) or 3 Seed coat present No phytomelan crust (seeds not black) Herbs to woody; sometimes succulent Tepals not spotted Nectaries septal Styles usually 1, simple Seed coat collapsed to + present Phytomelan crust (seeds black) from dry fruits; not in fleshy fruit

30. Figure 9.18 from the text

31. “Petaloid” Monocots—Asparagales: Agavaceae (The Agave Family) Warm temperate to tropical regions of the New World; maximum diversity in Mexico Rosette herbs, often with succulent leaves Number of species: ca. 300 species in 8-13 genera Flowers: tepals 6, stamens 6, carpels 3, fruits a loculicidal capsule Significant features: large, paniculate inflorescence Special uses: fiber, tequila, ornamentals. Required taxa: Agave, Yucca, Hosta

32. Agavaceae – Agave and Yucca Agave Yucca

33. Agave: bat pollinated Yucca: moth pollinated

34. Agavaceae: Hosta

35. Asparagales: Agavaceae Economic plants and products: Agave tequila

36. Asparagales: Agavaceae Economic plants and products: Fiber for rope from species of Yucca and Agave e.g., sisal hemp

37. “Petaloid” Monocots—Asparagales: Alliaceae (Onion Family) Widely distributed in temperate and tropical regions; also semiarid. Bulb-forming herbs Number of species: ca. 645 species, in 13 genera Flowers: Often showy, tepals 6, stamens 6, 3 connate carpels, ovary superior; fruit a loculicidal capsule. Significant features: sulfur-containing compounds Special uses: onion, garlic, leek, shallots, chives, used as food & seasonings; ornamentals Required taxa: Allium

38. Alliaceae - Allium -scapose herbs with bulbs + contractile roots -basally clustered leaves -umbellate inflorescence with bracts -6 petaloid tepals + 6 stamens -loculicidal capsule + black seeds

39. Alliaceae Economic plants and products: Allium species – onions, leeks, garlic! Ornamentals

40. “Petaloid” Monocots—Asparagales: Amaryllidaceae (Amaryllis or Daffodil Family) Widely distributed in temperate to tropical regions; maximal diversity in South Africa, Andean South America, and the Mediterranean Bulb-forming herbs with contractile roots Number of species: 870 species in 59 genera Flowers: often showy; tepals 6; stamens 6, sometimes adnate to perianth; carpels 3, inferior ovary; fruit usually a loculicidal capsule Significant features: special alkaloid compounds present Special uses: many ornamentals (Narcissus, Hippeastrum) Required taxa: Narcissus, Hippeastrum

41. Amaryllidaceae

42. Hymenocallis spider-lily Narcissus daffodil, jonquil, narcissus Corona sometimes present

43. Amaryllidaceae: Hippeastrum

44. “Petaloid” Monocots—Asparagales: Iridaceae (The Iris Family) Widespread in tropical and subtropical regions; absent in Australia. Herbs forming rhizomes, corms, or bulbs Number of species: ca. 1,750 species, 67 genera Flowers: radial or bilateral, showy; tepals 6, outer tepals often differentiated from inner; stamens (2) 3; carpels 3, fused into an inferior ovary; fruit a loculicidal capsule Significant features: leaves equitant Special uses: many ornamentals; saffron (Crocus sativus) Required taxa: Iris

45. Iridaceae

46. “Petaloid” Monocots—Asparagales: Orchidaceae (The Orchid Family) Widespread throughout the world; maximal diversity in tropical regions Primarily epiphytes; some terrestrial herbs, occasionally vines Diversity: ca. 19,500 species in 775-800 genera Flowers: showy, usually resupinate, bilateral, the median inner tepal differentiated into a labellum (lip); highly modified androecial and gynoecial parts, fused into a column; pollen grouped into soft or hard masses (pollinia); ovary inferior; placentation parietal; fruit a capsule dehiscing with (1-)3 or 6 slits; seeds tiny, dust-like Significant features: among the most specialized of all angiosperm flowers Special uses: many ornamentals; Vanilla Required taxa: *family only *change from lab manual

47. Orchid flower morphology

48. Orchidaceae Pollination function of column & pollinia

49. Asparagales: Orchidaceae Economic plants and products: Vanilla flavoring extracted from immature capsules of Vanilla planifolia