Question: Which plant has hanging groups of tube-shaped flowers, Moltkia or Saguaro?

Context paragraphs:
Moltkia (plant): Moltkia is a genus in the Boraginaceae family with about 9 species.  They are herby semibushes (shrubs) with dark green hairy leaves and hanging groups of tube-shaped flowers.  The species occur in the south of Europe and western Asia,where they are sparely hardy.

Hemiphora lanata: Hemiphora lanata is a flowering plant in the mint family Lamiaceae and is endemic to the south-west of Western Australia.  It is a sprawling shrub with its branches and leaves densely covered with white, woolly hairs and with deep pink or dark red, curved, tube-shaped flowers with spreading petal lobes on the end.  It is similar to "Hemiphora exserta" except for its cottony leaf-covering and its longer stamens.

Styphelia perileuca: Styphelia perileuca, commonly known as montane green five-corners is a plant in the heath family Ericaceae and is endemic to New South Wales.  It is an erect, spreading shrub with broad leaves with a spiky tip, and yellowish-green and red tube-shaped flowers with the petals rolled back.  It is only known from the eastern edge of the New England Tableland.

Dasymalla glutinosa: Dasymalla glutinosa is a flowering plant in the mint family Lamiaceae and is endemic to Western Australia.  It is a spreading, sticky shrub with glabrous branches, egg-shaped, stalkless leaves and small, white or cream-coloured, tube-shaped flowers.

Quoya oldfieldii: Quoya oldfieldii, commonly known as Oldfield's foxglove, is a flowering plant in the mint family Lamiaceae and is endemic to the south-west of Western Australia.  It is an erect shrub with its branches and leaves densely covered with a layer of brownish hairs.  The leaves are egg-shaped and the tube-shaped flowers are pink with purple spots inside.

Saguaro: The saguaro ( , ] ) (Carnegiea gigantea) is an arborescent (tree-like) cactus species in the monotypic genus Carnegiea, which can grow to be over 40 ft tall.  It is native to the Sonoran Desert in Arizona, the Mexican State of Sonora, and the Whipple Mountains and Imperial County areas of California.  The saguaro blossom is the state wildflower of Arizona.  Its scientific name is given in honor of Andrew Carnegie.  In 1994, Saguaro National Park, near Tucson, Arizona, was designated to help protect this species and its habitat.

Quoya atriplicina: Quoya atriplicina, commonly known as saltbush foxglove, is a flowering plant in the mint family Lamiaceae and is endemic to Western Australia.  It is a bushy shrub with its branches and leaves densely covered with a layer of hairs, giving them a greyish appearance.  The leaves are broad-elliptic to almost circular in shape and the tube-shaped flowers are pink with purple spots inside.

Quoya dilatata: Quoya dilatata is a flowering plant in the mint family Lamiaceae and is endemic to Western Australia.  It is a low, spreading shrub with its branches and leaves densely covered with a layer of white, woolly hairs.  The leaves are wrinkled or crinkly and the tube-shaped flowers are orange-red and hairy on the outside.

Pityrodia canaliculata: Pityrodia canaliculata is a flowering plant in the mint family Lamiaceae and is endemic to a small area in Western Australia.  It is a many-branched shrub with all its parts, except the petals covered with small, circular scales.  The tube-shaped flowers are white with reddish spots inside.

Prostanthera howelliae: Prostanthera howelliae is a flowering plant in the mint family Lamiaceae and is endemic to New South Wales and Queensland.  It is a small shrub with narrow stems, aromatic, hairy leaves and violet-coloured, tube-shaped flowers.

Supporting paragraphs: Moltkia (plant) Saguaro
Answer: Moltkia