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• All other flowering non-woody plants
• All other herbaceous, flowering dicots
• Cannabis sativa

Cannabis sativa — hemp

Facts

With a history of association with humans going back some 10,000 years, few plants come with more cultural baggage today than hemp. Probably native to Central Asia, humans have mainly used hemp for its fibers. In fact, until the early eighteenth century, hemp was the most important source of fiber in North America. Its use as a mild hallucinogen was of little economic importance until recent times. It is hard to estimate how many plants are illegally cultivated in North America, but law enforcement agencies harvest and destroy tens to hundreds of millions of cultivated and ruderal or escaped plants each year. Today, oil produced from hemp seeds is another significant product, and the fiber, seeds and oil are in turn made into a wide range of other products, including cosmetics, plastics and textiles.

Habitat

Anthropogenic (man-made or disturbed habitats), forests

Characteristics

• Clonal plantlets

  Bulbils

  the plant does not appear to have bulbils

  Bulblets replace flowers

  there are no bulblets where the flowers are located

• Flowers

  Anther spurs

  the anthers do not have spurs on them

  Calyx symmetry

  there are two or more ways to evenly divide the calyx (the calyx is radially symmetrical)

  Carpels fused

  the carpels are fused to one another

  Cleistogamous flowers

  there are no cleistogamous flowers on the plan

  Corolla morphology

  NA

  Corolla palate

  NA

  Corona lobe length

  0 mm

  Epicalyx

  the flower does not have an epicalyx

  Epicalyx number of parts

  0

  Flower description

  • NA
  • the flower has a superior ovary, and lacks a hypanthium

  Flower petal color

  NA

  Flower symmetry

  there are two or more ways to evenly divide the flower (the flower is radially symmetrical)

  Flowers sunken into stem

  no

  Form of style

  • NA
  • the style is unbranched, but it has two or more narrow appendages that are part of the stigma

  Fusion of sepals and petals

  NA

  Horns in hoods (Asclepias)

  NA

  Hypanthium

  the flower does not have a hypanthium

  Inflorescence one-sided

  the flowers are arrayed in a spiral around the inflorescence axis or branches, or occur singly, or in several ranks

  Inner tepals (Rumex)

  NA

  Nectar spur

  the flower has no nectar spurs

  Number of pistils

  • 1
  • NA

  Petal and sepal arrangement

  the flower includes only one cycle of petals or sepals

  Petal and sepal colors

  green to brown

  Petal appearance

  NA

  Petal folds or pleats

  NA

  Petal hairs (Viola)

  NA

  Petal tip shape

  NA

  Petal tips (Cuscuta)

  NA

  Reproductive system

  all the flowers on each plant have only carpels or only stamens, with only one type being present on each plant (dioecious)

  Scales inside corolla

  NA

  Sepal and petal color

  NA

  Sepal appendages

  the sepals do not have appendages on them

  Sepal appendages (Oenothera)

  NA

  Stamen attachment

  • NA
  • the stamens are not attached to the petals or tepals

  Stamen number

  • 5
  • NA

  Stamen position relative to petals

  • NA
  • the stamens are lined up with the sepals

  Staminodes

  there are no staminodes on the flower

  Umbel flower reproductive parts

  NA

  Upper lip of bilabiate corolla

  NA

• Fruits or seeds

  Achene surface (Polygonum)

  NA

  Achene type

  the fruit is an achene (dry, indehiscent, and usually one-seeded)

  Berry color

  NA

  Capsule color (Viola)

  NA

  Capsule ribs

  NA

  Capsule splitting

  NA

  Fruit (pyxis) dehiscence

  NA

  Fruit beak length

  0 mm

  Fruit features (Brassicaceae)

  NA

  Fruit length

  1–5 mm

  Fruit locules

  one

  Fruit type (general)

  the fruit is dry but does not split open when ripe

  Fruit type (specific)

  the fruit is an achene (dry, usually one-seeded, does not separate or split open at maturity)

  Legumes (Fabaceae)

  NA

  Mericarp length

  0 mm

  Mericarp segment shape (Desmodium)

  NA

  Other markings on berry

  NA

  Ovary stipe

  the ovary or fruit does not have a stipe

  Placenta arrangement

  the plant has apical placentation, where one or a few ovules develop at the top of a simple or compound ovary

  Rows of seeds in fruit (Brassicaceae)

  NA

  Schizocarpic fruit compression

  NA

  Schizocarpic fruit segments

  0

  Septum in fruit (Brassicaceae)

  NA

  Wings on fruit

  the fruit does not have wings on it

  prickles on fruits

  the fruits do not have thorn-like defensive structures

• Glands or sap

  Glands on leaf blade

  the leaf blades have glandular dots or scales

  Sap

  the sap is clear and watery

  Sap color

  the sap is clear

• Growth form

  Horizontal rooting stem

  the plant does not have stolons

  Lifespan

  the plant lives only a single year or less

  Parasitism

  the plant is not parasitic

  Plant color

  the leaves or young stems of the plant are green

  Spines on plant

  the plant has no spines

• Leaves

  Bracteole number (Apiaceae)

  0

  Bracts in plantain (Plantago)

  NA

  Final leaf segment length (compound lvs only)

  30–150 mm

  Hairs on underside of leaf

  the underside of the leaf is fuzzy or hairy

  Leaf arrangement

  • alternate: there is one leaf per node along the stem
  • opposite: there are two leaves per node along the stem

  Leaf blade base

  the leaf has a distinct leaf stalk (petiole)

  Leaf blade edges

  the edge of the leaf blade has teeth

  Leaf blade shape

  • the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
  • the leaf blade is linear (very narrow with more or less parallel sides)

  Leaf blade surface colors

  the upper side of the leaf blade is relatively uniform in color

  Leaf duration

  the leaves drop off in winter (or they whither but persist on the plant)

  Leaf form

  the leaves are green, with an expanded blade and a leaf-like texture

  Leaf spines

  there are no spines on the leaf edges

  Leaf type

  • the leaves are compound (made up of two or more discrete leaflets
  • the leaves are simple (lobed or unlobed but not separated into leaflets)

  Leaves per node

  • there are two leaves per node along the stem
  • there is one leaf per node along the stem

  Pinnately compound leaf type

  NA

  Specific leaf type

  • the leaf has lobes that radiate from the base, somewhat like a hand
  • the leaves are simple (lobed or unlobed but not separated into leaflets)

  Stipels

  NA

  Stipule features

  NA

• Place

  Habitat

  terrestrial

  New England state

  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont

  Specific habitat

  • forests
  • man-made or disturbed habitats

• Scent

  Plant odor

  • the plant has a pleasant smell, for example anise, fruit, mint or resin
  • the plant has an unpleasant smell

• Stem, shoot, branch

  Branched tendrils

  NA

  Hairs between stem nodes

  the hairs on the stem are plain, without glands or branches, and not tangled

  Hooked hairs on stem between nodes

  no

  Leaves on stem

  there is at least one full leaf above the base of the flowering stem

  Plant height

  20–300 cm

  Tendril origin

  NA

  Tendrils

  the plant does not have tendrils

Wetland status

Not classified

New England distribution and conservation status

From the dichotomous key of Flora Novae Angliae