rubberweed

runningpine Russian-olive

ragged-robin

Russian-thistle

rainlily

ryegrass

raintree

raisintree

S

ramshead

sacred-lily

rattail

salad-rocket

rattlepod

saltcedar

rattlesnake-root

redbay

saltmarsh saltmeadow

red bead

Rangoon-creeper

rattlesnake-plantain

saltgrass

salt-tree sandbar

sandboxtree sandbur sandgrass sandheath sandhill sandmint sandmyrtle sandreed sandroot sandverbena sappan sapsuck-bush saskatoon satingrass satinpoppy

sawfern sawleaf sawpetal sawtooth Scarboro-lily scarlet-bugler scarletbush scarletfunnel scarlet plume scholartree scorpion-senna scouring-rush

screwbean

screwpine screwpod scurf-pea

scurvygrass

sea-buckthorn

seagrape

seaholly seakale

sea-lavender

sea-onion

seaplum

sea-urchin

ricepaper-plant

riceroot

ringleaf

ripgut

rippleseed

paperbark

pansy-orchid

paperflower

riverbank

ptarmiganberry

rock beauty

paper-mulberry

puncturevine

papertree

purplebell

rock brake

parasoltree

purplecane

parrot feather

purplecone

Parsons (arborvitae, etc.)

purplecup

partridgeberry

purple-eye

partridgefoot

purple-lady

partridge-pea

purpleleaf

pasqueflower

purplenet

passionflower

purplespot

rockcress
rock jasmine
rockmat
rock purslane
rockspirea
rockspray
rootspine

rosa-de-montana

seepweed seepwillow sego-lily selfheal

Seneca-snakeroot

senna-pea sensitive-pea sensitiveplant

serpentroot servicetree

peabush

purplestem

peachbrush

purplestripe

peachleaf

purpletop

pear-hip

purplewreath

pearleaf

pussy-ears

pearlstripe

pussypaws

pea-shrub

peatpink

rosemyrtle

sharplobe